Aquatic Sciences and Fisheries Thesaurus

ASFIS Reference Series, No. 6, Revision 1, 1986

Compiled by: E. Fagetti, D.W. Privett, & J.R.L. Sears

    The following list of terms are used by ASFA indexers to describe the contents of publications in a consistent, comprehensive and concise manner. Each term may be followed by:
  • Notes: These comments provide additional information about the term (e.g. definitions and usage history).
  • BT and NT: These labels indicate broader and narrower terms, respectively. They reflect the hierarchical nature of the descriptors (e.g. DISEASES is a broad term relative to FISH DISEASES).
  • RT: Related terms are non-hierarchical relations which direct the users to alternative descriptors in the event that the initial term is conceptually inappropriate. Please note that a maximum of three related terms are provided in this temporary edition.
  •     The ASFA thesaurus is split into several html files to facilitate loading. Use the following alphabet to maneuver, or use your browser's FIND button to search for specific words within a page. Please note: This online thesaurus is a rudimentary version of a fully interactive thesaurus that will be completed in the near future. The present version does not reproduce the printed thesaurus in its entirety. Specifically, a maximum of three related terms are provided, and invalid terms (and corresponding translation) are not included.
     

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    S-WAVES
        BT: BODY WAVES
        RT: P-WAVES
        RT: SHEAR WAVE VELOCITIES

    SABKHAS
        NT: PLAYAS
        RT: ARID ENVIRONMENTS
        RT: COASTAL LAGOONS
        RT: DESERTS

    SACCHARIDES
        BT: CARBOHYDRATES
        NT: MONOSACCHARIDES
        NT: POLYSACCHARIDES

    SACRIFICIAL ANODES
        BT: ANODES
        RT: CATHODIC PROTECTION

    SAFETY DEVICES
        BT: EQUIPMENT
        RT: ACCIDENT PREVENTION
        RT: ACCIDENTS
        RT: ALARM SYSTEMS

    SAFETY REGULATIONS
        BT: LEGISLATION
        NT: DIVING REGULATIONS
        RT: ACCIDENT PREVENTION
        RT: EXPLOSIVES
        RT: FIRE PREVENTION

    SAILING DIRECTIONS
        BT: DOCUMENTS
        RT: NAVIGATIONAL AIDS
        RT: PILOT CHARTS

    SAILING SHIPS
        BT: SHIPS
        NT: YACHTS
        RT: FUEL ECONOMY
        RT: SAILS

    SAILS
        BT: PROPULSION SYSTEMS
        RT: SAILING SHIPS
        RT: YACHTING
        RT: YACHTS

    SALINE INTRUSION
        RT: ESTUARIES
        RT: GROUND WATER
        RT: SALINE WATER

    SALINE WATER
        Notes: Inland water bodies with high salt concentration
        BT: WATER
        RT: BRINES
        RT: DESALINATION
        RT: GROUNDWATER POLLUTION

    SALINITY
        BT: CHEMICAL PROPERTIES
        NT: CHLORINITY
        NT: CHLOROSITY
        NT: PALAEOSALINITY
        NT: SURFACE SALINITY
        RT: ABIOTIC FACTORS
        RT: ATMOSPHERIC PRECIPITATIONS
        RT: CABBELING

    SALINITY CHARTS
        BT: HYDROGRAPHIC CHARTS
        RT: ISOHALINES
        RT: SALINITY
        RT: SALINITY SECTIONS

    SALINITY DATA
        BT: HYDROGRAPHIC DATA
        RT: LONG-TERM RECORDS
        RT: OCEANOGRAPHIC DATA
        RT: SALINITY

    SALINITY EFFECTS
        BT: ENVIRONMENTAL EFFECTS
        RT: SALINITY
        RT: SALINITY TOLERANCE

    SALINITY GRADIENTS
        RT: DOUBLE DIFFUSION
        RT: GRADIENTS
        RT: SALINITY

    SALINITY MAXIMUM LAYER
        BT: CORE LAYERS (WATER)
        RT: CORE LAYER METHOD
        RT: SALINITY MINIMUM LAYER
        RT: SALINITY PROFILES

    SALINITY MEASUREMENT
        BT: MEASUREMENT
        RT: CONDUCTIVITY SENSORS
        RT: ELECTRICAL CONDUCTIVITY
        RT: IN SITU MEASUREMENTS

    SALINITY MEASURING EQUIPMENT
        RT: CONDUCTIVITY SENSORS
        RT: CTD PROFILERS
        RT: MEASURING DEVICES

    SALINITY MICROSTRUCTURE
        Notes: Variations in the distribution of salinity on a scale of 10 cm or less
        BT: MICROSTRUCTURE
        RT: SALINITY

    SALINITY MINIMUM LAYER
        BT: CORE LAYERS (WATER)
        RT: CORE LAYER METHOD
        RT: SALINITY
        RT: SALINITY MAXIMUM LAYER

    SALINITY POWER
        Notes: Utilizing the osmotic pressure difference between two bodies of water of differing salinities as a source of energy
        BT: POWER FROM THE SEA
        RT: OSMOTIC PRESSURE
        RT: SALINITY
        RT: SALINITY GRADIENTS

    SALINITY PROFILES
        BT: VERTICAL PROFILES
        RT: CTD PROFILERS
        RT: SALINITY
        RT: SALINITY GRADIENTS

    SALINITY SCALES
        NT: PRACTICAL SALINITY SCALE
        RT: SALINITY

    SALINITY SECTIONS
        BT: HYDROGRAPHIC SECTIONS
        RT: ISOHALINES
        RT: SALINITY
        RT: SALINITY CHARTS

    SALINITY STRATIFICATION
        BT: STRATIFICATION
        RT: DENSITY STRATIFICATION
        RT: HALOCLINE
        RT: SALT-WEDGE ESTUARIES

    SALINITY TABLES
        BT: OCEANOGRAPHIC TABLES
        RT: SALINITY MEASUREMENT

    SALINITY TOLERANCE
        BT: TOLERANCE
        RT: AMPHIHALINE SPECIES
        RT: ESTUARINE ORGANISMS
        RT: EURYHALINITY

    SALINOMETERS
        BT: MEASURING DEVICES
        RT: LABORATORY EQUIPMENT
        RT: OCEANOGRAPHIC EQUIPMENT
        RT: SALINITY

    SALMON FISHERIES
        Notes: Added in 1982
        BT: FINFISH FISHERIES
        RT: ANGLING
        RT: FISH CULTURE
        RT: LAKE FISHERIES

    SALT ADVECTION
        BT: ADVECTION
        RT: CONSERVATION OF SALT
        RT: SALT BUDGET

    SALT BUDGET
        RT: CONSERVATION OF SALT
        RT: DISSOLVED SALTS
        RT: RIVER DISCHARGE

    SALT DEPOSITS
        RT: DESALINATION
        RT: EVAPORITES
        RT: PLAYAS

    SALT DOMES
        BT: STRUCTURAL DOMES
        RT: ANTICLINES
        RT: CAP ROCKS
        RT: DIAPIRISM

    SALT FINGERS
        RT: DISSOLVED SALTS
        RT: DOUBLE DIFFUSION
        RT: INTERFACE PHENOMENA

    SALT FLUX
        RT: DISSOLVED SALTS
        RT: SALINITY
        RT: SALT BUDGET

    SALT LAKES
        BT: LAKES
        RT: DESALINATION
        RT: DISSOLVED SALTS
        RT: PLAYAS

    SALT MARSHES
        BT: MARSHES
        RT: ESTUARIES
        RT: ESTUARINE SEDIMENTATION
        RT: PROGRADATION

    SALT NUCLEI
        RT: AIR BUBBLES
        RT: BUBBLE BURSTING
        RT: CONDENSATION

    SALT PARTICLES
        BT: ATMOSPHERIC PARTICULATES
        RT: AEROSOLS
        RT: AIR-WATER EXCHANGES
        RT: BUBBLE BURSTING

    SALT-WEDGE ESTUARIES
        BT: ESTUARIES
        RT: ESTUARINE DYNAMICS
        RT: FRESH WATER
        RT: HALOCLINE

    SALT WEDGES
        RT: ESTUARIES
        RT: ESTUARINE CHEMISTRY
        RT: ESTUARINE DYNAMICS

    SALTATION
        RT: BED LOAD
        RT: PARTICLE MOTION
        RT: SEDIMENT TRANSPORT

    SALTS
        NT: DISSOLVED SALTS
        RT: CARBONATES
        RT: CHEMICAL COMPOUNDS
        RT: CHEMICAL EXTRACTION

    SALVAGE EQUIPMENT
        BT: EQUIPMENT
        RT: LIFTING TACKLE
        RT: SALVAGING
        RT: WATER PUMPS

    SALVAGING
        Notes: Before 1986 search also SALVAGE
        RT: LIFTING
        RT: LIFTING TACKLE
        RT: LOCATING

    SAMARIUM
        BT: CHEMICAL ELEMENTS
        RT: RARE EARTHS
        RT: SAMARIUM COMPOUNDS
        RT: SAMARIUM ISOTOPES

    SAMARIUM COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: SAMARIUM

    SAMARIUM ISOTOPES
        BT: ISOTOPES
        RT: SAMARIUM

    SAMPLE CONTAMINATION
        RT: SAMPLE STORAGE
        RT: SAMPLES
        RT: SAMPLING

    SAMPLE STORAGE
        RT: CORE HANDLING
        RT: SAMPLE CONTAMINATION
        RT: SAMPLES

    SAMPLERS
        NT: SEDIMENT SAMPLERS
        NT: WATER SAMPLERS
        RT: COLLECTING DEVICES
        RT: OCEANOGRAPHIC EQUIPMENT
        RT: SAMPLING

    SAMPLES
        NT: GEOLOGICAL SAMPLES
        NT: WATER SAMPLES
        RT: GEOLOGICAL COLLECTIONS
        RT: SAMPLE CONTAMINATION
        RT: SAMPLE STORAGE

    SAMPLING
        Notes: Use of a more specific term is recommended
        NT: AIR SAMPLING
        NT: BIOLOGICAL SAMPLING
        NT: SEAFLOOR SAMPLING
        NT: STATISTICAL SAMPLING
        NT: WATER SAMPLING
        RT: CENSUS
        RT: RESEARCH VESSELS
        RT: SAMPLE CONTAMINATION

    SANCTUARIES
        Notes: An area reserved for the protection of particular species of animals during part or all of the year. Added in 1982
        RT: MARINE PARKS
        RT: NATURE CONSERVATION
        RT: RARE SPECIES

    SAND
        BT: CLASTICS
        NT: QUICKSANDS
        RT: AGGREGATES
        RT: ALLUVIAL DEPOSITS
        RT: ARENACEOUS DEPOSITS

    SAND BANKS
        BT: BED FORMS
        RT: BANKS (TOPOGRAPHY)
        RT: MUD BANKS
        RT: SHOALS

    SAND BARS
        BT: BED FORMS
        RT: NEARSHORE BARS
        RT: SAND

    SAND PATCHES
        BT: BED FORMS
        RT: SAND
        RT: TRANSVERSE BED FORMS

    SAND RIBBONS
        BT: BED FORMS
        RT: SAND

    SAND RIPPLES
        BT: BED FORMS
        RT: BEACH FEATURES
        RT: RIPPLE MARKS
        RT: TRANSVERSE BED FORMS

    SAND STRUCTURES
        BT: ARTIFICIAL ISLANDS
        RT: GEOTECHNOLOGY

    SAND WAVES
        BT: BED FORMS
        RT: DUNES
        RT: KEEL CLEARANCE
        RT: TIDAL CURRENTS

    SANDSTONE
        BT: CLASTICS
        NT: OIL SANDS
        RT: ARENITES
        RT: EOLIAN DEPOSITS
        RT: EOLIAN TRANSPORT

    SANITARY ENGINEERING
        BT: ENGINEERING
        RT: HYGIENE
        RT: POLLUTION CONTROL
        RT: SEWAGE DISPOSAL

    SAPONINS
        BT: GLYCOSIDES

    SAPONITE
        BT: CLAY MINERALS

    SAPROBIONTS
        Notes: Organisms feeding on decaying organic matters. Added in 1982
        NT: SAPROPHYTES
        NT: SAPROZOITES
        RT: ORGANIC MATTER

    SAPROPELITE
        RT: COAL
        RT: KEROGEN
        RT: OIL SHALE

    SAPROPELS
        Notes: Before 1982 search SAPROPEL
        BT: ORGANIC SEDIMENTS
        RT: ANOXIC CONDITIONS
        RT: ANOXIC SEDIMENTS
        RT: DETRITUS

    SAPROPHYTES
        Notes: Plants that obtain nourishment from dead or decaying organic matter. Added in 1980
        BT: SAPROBIONTS
        RT: BACTERIA
        RT: FOOD CHAINS
        RT: FUNGI

    SAPROPLANKTON
        Notes: Plankton found on the surface of stagnant water, developing on decaying organic matter. Added in 1982
        BT: ZOOPLANKTON
        RT: ORGANIC MATTER
        RT: STAGNANT WATER

    SAPROZOITES
        Notes: Animals living on dead or decaying organic matter. Added in 1982
        BT: SAPROBIONTS
        RT: ORGANIC MATTER

    SATELLITE ALTIMETRY
        BT: ALTIMETRY
        RT: GEOID
        RT: HEIGHT
        RT: RADAR ALTIMETRY

    SATELLITE COMMUNICATION
        BT: COMMUNICATION SYSTEMS
        RT: COMMUNICATION SATELLITES
        RT: TELEMETRY

    SATELLITE MOSAICS
        Notes: Satellite-sensed images assembled to form a continuous picture of portions of the Earth's surface
        BT: AUDIOVISUAL MATERIAL
        RT: AERIAL PHOTOGRAPHS
        RT: INFRARED IMAGERY
        RT: MAPPING

    SATELLITE NAVIGATION
        BT: POSITION FIXING
        RT: NAVIGATIONAL SATELLITES

    SATELLITE PHOTOGRAPHY
        BT: AERIAL PHOTOGRAPHY
        RT: CAMERAS
        RT: MULTISPECTRAL SCANNERS
        RT: SATELLITE MOSAICS

    SATELLITE SENSING
        BT: GEOSENSING
        RT: ICE OBSERVATIONS
        RT: INFRARED IMAGERY
        RT: MICROWAVE IMAGERY

    SATELLITES
        BT: VEHICLES
        NT: COMMUNICATION SATELLITES
        NT: NAVIGATIONAL SATELLITES
        NT: SCIENTIFIC SATELLITES
        RT: AERIAL SURVEYS
        RT: ASTRONOMY
        RT: ELECTRONIC EQUIPMENT

    SATURATED HYDROCARBONS
        BT: HYDROCARBONS
        NT: ACYCLIC HYDROCARBONS
        NT: ALICYCLIC HYDROCARBONS

    SATURATION
        NT: SUPERSATURATION
        RT: CONDENSATION
        RT: EVAPORATION
        RT: SATURATION DEPTH

    SATURATION DEPTH
        RT: SATURATION
        RT: WATER DEPTH

    SATURATION DIVING
        BT: DIVING
        RT: BREATHING MIXTURES
        RT: DECOMPRESSION
        RT: DIVING BELLS

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SATURATION VAPOUR PRESSURE
        BT: VAPOUR PRESSURE
        RT: CONDENSATION
        RT: DEW POINT
        RT: HUMIDITY

    SCALE MODELS
        BT: MODELS
        NT: HYDRAULIC MODELS
        NT: SHIP MODELS
        RT: AUDIOVISUAL MATERIAL
        RT: FLUMES
        RT: LABORATORY EQUIPMENT

    SCALE READING
        BT: AGE DETERMINATION
        RT: GROWTH
        RT: LIFE CYCLE
        RT: SCALES

    SCALES
        BT: EXOSKELETON
        RT: INTEGUMENTARY SYSTEM
        RT: SCALE READING

    SCALING
        Notes: Lime or other scale formation on structures and equipment
        RT: CLEANING
        RT: COATING MATERIALS
        RT: FOULING

    SCALLOP CULTURE
        Notes: Before 1982 search MOLLUSC CULTURE
        BT: MOLLUSC CULTURE
        RT: AQUACULTURE DEVELOPMENT
        RT: MARINE AQUACULTURE
        RT: OFF-BOTTOM CULTURE

    SCALLOP FISHERIES
        Notes: Added in 1982
        BT: MOLLUSC FISHERIES
        RT: COASTAL FISHERIES
        RT: MARINE FISHERIES

    SCANDIUM
        BT: CHEMICAL ELEMENTS
        RT: METALS
        RT: SCANDIUM COMPOUNDS
        RT: SCANDIUM ISOTOPES

    SCANDIUM COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: SCANDIUM

    SCANDIUM ISOTOPES
        BT: ISOTOPES
        RT: SCANDIUM

    SCATTER DIAGRAMS
        BT: STATISTICAL TABLES
        RT: REGRESSION ANALYSIS

    SCATTERANCE METERS
        BT: LIGHT MEASURING INSTRUMENTS
        RT: LIGHT SCATTERING
        RT: SCATTERING COEFFICIENT
        RT: VOLUME SCATTERING FUNCTION

    SCATTERING COEFFICIENT
        BT: OPTICAL PROPERTIES
        RT: LIGHT SCATTERING
        RT: OPTICAL CLASSIFICATION
        RT: SCATTERANCE METERS

    SCATTERING LAYERS
        BT: DISCONTINUITY LAYERS
        RT: ECHOSOUNDING
        RT: SWIM BLADDER
        RT: ZOOPLANKTON

    SCATTEROMETERS
        BT: MICROWAVE RADAR
        RT: BACKSCATTER
        RT: MEASURING DEVICES
        RT: MICROWAVES

    SCAVENGERS
        Notes: Animals feeding on dead animal material. Added in 1980
        BT: HETEROTROPHIC ORGANISMS
        RT: FEEDING BEHAVIOUR

    SCHISTS
        BT: METAMORPHIC ROCKS
        NT: GREENSCHISTS

    SCHOOLING BEHAVIOUR
        Notes: Swarming, herding and flocking of any aquatic population
        BT: SOCIAL BEHAVIOUR
        RT: FEEDING BEHAVIOUR
        RT: PROTECTIVE BEHAVIOUR

    SCIENTIFIC PERSONNEL
        Notes: Before 1986 search also SCIENTISTS. Added in 1980
        BT: PERSONNEL
        NT: BIOLOGISTS
        NT: ECOLOGISTS
        NT: ECONOMISTS
        NT: FRESHWATER SCIENTISTS
        NT: GEOLOGISTS
        NT: INFORMATION SCIENTISTS
        NT: MARINE SCIENTISTS
        NT: METEOROLOGISTS
        NT: STATISTICIANS
        RT: BIOGRAPHIES
        RT: CONSULTANTS
        RT: DIRECTORIES

    SCIENTIFIC SATELLITES
        BT: SATELLITES
        RT: GEOSENSING
        RT: INSTRUMENT PLATFORMS
        RT: SATELLITE SENSING

    SCOUR AND FILL
        BT: SEDIMENTARY STRUCTURES
        RT: CURRENT SCOURING
        RT: SCOURING

    SCOUR HOLLOWS
        BT: BED FORMS
        RT: CURRENT SCOURING
        RT: OBSTACLE MARKS
        RT: TIDAL CURRENTS

    SCOUR MARKS
        BT: CURRENT MARKS
        RT: CURRENT SCOURING

    SCOUR PROTECTION
        BT: PROTECTION
        RT: ARTIFICIAL SEAWEED
        RT: CURRENT SCOURING
        RT: PILES

    SCOURING
        Notes: Use of a more specific term is recommended
        BT: EROSION
        NT: CURRENT SCOURING
        NT: ICEBERG SCOURING
        NT: WAVE SCOURING
        RT: ARTIFICIAL SEAWEED
        RT: BOTTOM CURRENTS
        RT: BRIDGES

    SCREENS
        RT: ANADROMOUS MIGRATIONS
        RT: AQUACULTURE EQUIPMENT
        RT: FISHWAYS

    SCUBA DIVING
        Notes: Before 1982 search DIVING
        BT: DIVING
        RT: BREATHING APPARATUS
        RT: BREATHING MIXTURES
        RT: RECREATION

    SEA BREEZES
        Notes: Blowing from sea to land
        BT: BREEZES
        RT: DAYTIME
        RT: LAND AND SEA BREEZES
        RT: LAND BREEZES

    SEA GRASS
        Notes: Species of embryophytes living in marine coastal waters
        RT: BOTANICAL RESOURCES
        RT: HARVESTING
        RT: PLANT POPULATIONS

    SEA ICE
        BT: ICE
        RT: BRINES
        RT: FAST ICE
        RT: FLOATING ICE

    SEA LEVEL
        Notes: Height or level of the sea surface
        NT: ISOSTATIC SEA LEVEL
        NT: MEAN SEA LEVEL
        NT: STERIC SEA LEVEL
        RT: DATUM LEVELS
        RT: EUSTATIC CHANGES
        RT: HYPSOMETRY

    SEA LEVEL CHANGES
        BT: LONG-TERM CHANGES
        RT: ATOLLS
        RT: CLIMATIC CHANGES
        RT: COAST DEFENCES

    SEA LEVEL MEASUREMENT
        Notes: Before 1984 search also SEA LEVEL MEASURING
        BT: WATER LEVEL MEASUREMENT
        RT: BENCH MARKS
        RT: SATELLITE ALTIMETRY
        RT: SEA LEVEL

    SEA LEVEL PRESSURE
        BT: ATMOSPHERIC PRESSURE
        RT: ANTICYCLONES
        RT: BAROMETERS
        RT: CLIMATE

    SEA LEVEL VARIATIONS
        RT: BEACH MORPHOLOGY
        RT: COAST DEFENCES
        RT: SEA LEVEL

    SEA SICKNESS
        BT: HUMAN DISEASES
        RT: MEDICINE
        RT: SHIP MOTION

    SEA STATE
        RT: ENVIRONMENTAL CONDITIONS
        RT: MICROWAVE IMAGERY
        RT: RADAR IMAGERY

    SEA STATE SCALES
        RT: BEAUFORT SCALE
        RT: SEA STATE
        RT: SURFACE WATER WAVES

    SEA SURFACE
        RT: AIR-SEA INTERACTION
        RT: AIR-WATER EXCHANGES
        RT: AIR-WATER INTERFACE

    SEA WALLS
        BT: COAST DEFENCES
        RT: BREAKWATERS
        RT: FLOODS
        RT: ICE LOADS

    SEA WATER
        BT: WATER
        NT: ARTIFICIAL SEAWATER
        NT: DENSE WATER
        NT: FOSSIL SEA WATER
        NT: STANDARD SEA WATER
        RT: AGE OF SEAWATER
        RT: CONSERVATIVE PROPERTIES
        RT: DESALINATION

    SEABED CONVENTIONS
        BT: INTERNATIONAL AGREEMENTS
        RT: INTERNATIONAL LAW
        RT: INTERNATIONAL ORGANIZATIONS
        RT: LAW OF THE SEA

    SEABED DEPOSITS
        BT: MINERAL DEPOSITS
        NT: AGGREGATES
        NT: FERROMANGANESE NODULES
        NT: PHOSPHORITE NODULES
        NT: PLACERS
        RT: DEEP-SEA MINING
        RT: METALLIFEROUS SEDIMENTS
        RT: MINING

    SEABED DRIFTERS
        BT: SUBSURFACE DRIFTERS
        RT: BOTTOM CURRENTS
        RT: CURRENT MEASUREMENT

    SEABED PROTECTION
        BT: PROTECTION
        RT: ARTIFICIAL SEAWEED

    SEABED VEHICLES
        BT: UNMANNED VEHICLES
        RT: OCEAN FLOOR
        RT: SEAFLOOR SAMPLING
        RT: SEDIMENT SAMPLING

    SEABIGHTS
        BT: SUBMARINE FEATURES
        RT: RELIEF FORMS

    SEACHANNELS
        BT: BED FORMS
        RT: ABYSSAL PLAINS
        RT: BOTTOM EROSION
        RT: CHANNELS

    SEAFLOOR MAPPING
        BT: MAPPING
        RT: BATHYMETRIC CHARTS
        RT: BATHYMETRY
        RT: ECHOSOUNDING

    SEAFLOOR SAMPLING
        BT: SAMPLING
        NT: SEDIMENT SAMPLING
        RT: BENTHOS
        RT: BENTHOS COLLECTING DEVICES
        RT: CORES

    SEAFLOOR SPREADING
        RT: CONTINENTAL DRIFT
        RT: FRACTURE ZONES
        RT: HEAT FLOW

    SEAFOOD
        Notes: Added in 1980
        BT: HUMAN FOOD
        RT: COMMERCIAL SPECIES
        RT: MARINE AQUACULTURE
        RT: MARINE CRUSTACEANS

    SEAKNOLLS
        BT: SUBMARINE FEATURES
        RT: RELIEF FORMS

    SEALS (STOPPERS)
        RT: LEAKS

    SEAMANSHIP
        RT: DEPLOYMENT
        RT: EDUCATION
        RT: GEAR HANDLING

    SEAMOATS
        BT: BED FORMS
        RT: BOTTOM CURRENTS
        RT: BOTTOM EROSION
        RT: EROSION FEATURES

    SEAMOUNT CHAINS
        BT: SUBMARINE FEATURES
        RT: HOT SPOTS
        RT: RELIEF FORMS
        RT: SEAMOUNTS

    SEAMOUNTS
        BT: SUBMARINE FEATURES
        NT: GUYOTS
        RT: ARCHIPELAGIC APRONS
        RT: MOUNTAINS
        RT: RELIEF FORMS

    SEAQUAKES
        RT: EARTHQUAKES

    SEARCH AND RESCUE
        RT: ACCIDENTS
        RT: DIVING
        RT: EMERGENCY VESSELS

    SEASON REGULATIONS
        BT: FISHERY REGULATIONS

    SEASONAL DISTRIBUTION
        Notes: Descriptor to be used only as a qualifier. Before 1982 search TEMPORAL DISTRIBUTION
        BT: TEMPORAL DISTRIBUTION
        RT: MAPS
        RT: MIGRATIONS
        RT: SEASONAL VARIATIONS

    SEASONAL THERMOCLINE
        BT: THERMOCLINE
        RT: METALIMNION
        RT: SEASONAL VARIATIONS

    SEASONAL VARIATIONS
        Notes: Changes between successive seasons. Used only as a qualifier
        BT: PERIODIC VARIATIONS
        RT: ANNUAL
        RT: ANNUAL VARIATIONS
        RT: HORIZONTAL DISTRIBUTION

    SEASONALITY
        Notes: Before 1982 search also SEASONAL VARIATIONS
        BT: PERIODICITY
        RT: MIGRATIONS
        RT: MONSOONS
        RT: SEASONAL DISTRIBUTION

    SEASONS
        Notes: Use of a more specific term is recommended. Added in 1980
        NT: AUTUMN
        NT: COLD SEASON
        NT: DRY SEASON
        NT: RAINY SEASON
        NT: SPRING
        NT: SUMMER
        NT: WINTER
        RT: CLIMATE
        RT: CLIMATIC ZONES
        RT: CLIMATOLOGY

    SEAWATER EVOLUTION
        RT: ATMOSPHERE EVOLUTION
        RT: EARTH
        RT: GEOCHEMISTRY

    SEAWEED CULTURE
        Notes: Methods and techniques for culture and harvesting of seaweeds
        BT: AQUACULTURE
        RT: BRACKISHWATER AQUACULTURE
        RT: CULTURE TANKS
        RT: CULTURES

    SEAWEED HARVESTING
        Notes: Added in 1982
        BT: MARINE FISHERIES
        RT: HARVESTING MACHINES
        RT: SEAWEED PROCESSING
        RT: SEAWEED PRODUCTS

    SEAWEED PROCESSING
        Notes: Processing of marine plants and marine plant products
        BT: FISHERY INDUSTRY
        RT: SEAWEED HARVESTING
        RT: SEAWEED PRODUCTS
        RT: SEAWEEDS

    SEAWEED PRODUCTS
        BT: PROCESSED FISHERY PRODUCTS
        NT: AGAR
        NT: ALGINATES
        NT: CARRAGEENINS
        RT: BOTANICAL RESOURCES
        RT: FEED
        RT: HUMAN FOOD

    SEAWEED STATISTICS
        Notes: Tabulation of harvested macro algae from natural beds or artificial culture
        BT: CATCH STATISTICS
        RT: AQUACULTURE STATISTICS
        RT: BOTANICAL RESOURCES
        RT: SEAWEED CULTURE

    SEAWEEDS
        Notes: Any macro-algae of marine environment, mainly species of coastal region
        BT: WEEDS
        RT: ALGOLOGISTS
        RT: ALGOLOGY
        RT: ARTIFICIAL SEAWEED

    SECCHI DISCS
        BT: LIGHT MEASURING INSTRUMENTS
        RT: EXTINCTION COEFFICIENT
        RT: LIGHT PENETRATION
        RT: VISIBILITY UNDERWATER

    SECONDARY PRODUCTION
        BT: BIOLOGICAL PRODUCTION
        RT: CARNIVORES
        RT: FOOD CHAINS
        RT: HERBIVORES

    SECONDARY SEXUAL CHARACTERS
        Notes: Added in 1980
        BT: SEX CHARACTERS
        RT: SEX HORMONES
        RT: SEXUAL DIMORPHISM
        RT: TAXONOMY

    SECRETION
        NT: NEUROSECRETION
        RT: BYSSUS
        RT: EXCRETION
        RT: GLANDS

    SECRETORY ORGANS
        NT: GLANDS
        RT: ANATOMY
        RT: MUCUS
        RT: SECRETION

    SECRETORY PRODUCTS
        NT: HORMONES
        NT: MUCUS
        RT: GLANDS
        RT: SECRETION
        RT: SECRETORY ORGANS

    SECURITY
        Notes: Use for national defence, and for protective measures for drilling platforms, fishing fleets etc. against terrorism and sabotage
        NT: UNDERSEA WARFARE
        RT: ARTIFICIAL HARBOURS
        RT: DEFENCE CRAFT
        RT: FISHERY PROTECTION

    SEDENTARY SPECIES
        Notes: Added in 1980
        BT: SPECIES
        RT: COASTAL STATES
        RT: CONTINENTAL SHELVES
        RT: FISHING RIGHTS

    SEDIMENT ANALYSIS
        Notes: Analysis of sediments for determination of organic and inorganic components including minerals
        NT: CORE ANALYSIS
        RT: ANALYSIS
        RT: ANALYTICAL TECHNIQUES
        RT: CHEMICAL ANALYSIS

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SEDIMENT CHEMISTRY
        BT: GEOCHEMISTRY
        RT: ATMOSPHERE EVOLUTION
        RT: BIOGEOCHEMISTRY
        RT: CHEMICAL PROPERTIES

    SEDIMENT COLLECTIONS
        Notes: Collections of sediment samples obtained mainly by coring
        BT: COLLECTIONS
        RT: CORING
        RT: SEDIMENT SAMPLING
        RT: SEDIMENTS

    SEDIMENT COMPOSITION
        BT: COMPOSITION
        RT: SEDIMENT ANALYSIS
        RT: SEDIMENT CHEMISTRY
        RT: SEDIMENT TEXTURE

    SEDIMENT DENSITY
        BT: DENSITY
        NT: WET BULK DENSITY
        RT: DENSITY MEASUREMENT
        RT: SEDIMENT ANALYSIS
        RT: SEDIMENT PROPERTIES

    SEDIMENT DISTRIBUTION
        Notes: Geographic distribution of bottom sediments
        BT: DISTRIBUTION
        RT: BOTTOM TOPOGRAPHY
        RT: GEOGRAPHICAL DISTRIBUTION
        RT: GEOLOGICAL MAPS

    SEDIMENT DRIFTS
        BT: BED FORMS
        RT: BOTTOM CURRENTS
        RT: DEPOSITION FEATURES
        RT: SOIL MECHANICS

    SEDIMENT DYNAMICS
        BT: DYNAMICS
        RT: BOTTOM STRESS
        RT: CHANNEL FLOW
        RT: PARTICLE MOTION

    SEDIMENT GRAVITY FLOWS
        BT: SEDIMENT MOVEMENT
        NT: FLUIDIZED SEDIMENT FLOW
        NT: GRAIN FLOW
        NT: LIQUEFIED SEDIMENT FLOW
        NT: TURBIDITY CURRENTS

    SEDIMENT LOAD
        NT: BED LOAD
        NT: SUSPENDED LOAD
        RT: CLAYS
        RT: GRAVEL
        RT: SAND

    SEDIMENT MIXING
        NT: BIOTURBATION
        NT: GAS TURBATION
        RT: MIXING PROCESSES
        RT: SEDIMENT SORTING
        RT: SEDIMENTS

    SEDIMENT MOVEMENT
        NT: MASS MOVEMENT
        NT: SEDIMENT GRAVITY FLOWS
        RT: MOTION
        RT: PARTICLE MOTION
        RT: SEDIMENT DYNAMICS

    SEDIMENT NOISE
        Notes: Noise created by movement of sand and shingle due to currents and waves
        BT: AMBIENT NOISE
        RT: SEDIMENT MOVEMENT
        RT: SEDIMENTS

    SEDIMENT POLLUTION
        Notes: Pollution of sediments
        BT: POLLUTION
        RT: CHEMICAL POLLUTION
        RT: GROUNDWATER POLLUTION
        RT: HEAVY METALS

    SEDIMENT PROPERTIES
        BT: PROPERTIES
        NT: GRAIN PROPERTIES
        NT: SEDIMENT STABILITY
        NT: SEDIMENT STRUCTURE
        NT: SEDIMENT TEXTURE
        RT: ACOUSTIC DATA
        RT: ACOUSTIC IMPEDANCE
        RT: BEARING CAPACITY

    SEDIMENT SAMPLERS
        BT: SAMPLERS
        NT: CORERS
        NT: DREDGES (GEOLOGY)
        NT: DRILLS
        NT: GRABS
        NT: PORE WATER SAMPLERS
        RT: GEOLOGICAL EQUIPMENT
        RT: OCEANOGRAPHIC EQUIPMENT
        RT: SEAFLOOR SAMPLING

    SEDIMENT SAMPLES
        BT: GEOLOGICAL SAMPLES
        NT: CORES
        NT: DREDGED SAMPLES
        RT: GEOLOGICAL COLLECTIONS
        RT: GEOLOGICAL DATA
        RT: OCEANOGRAPHIC EQUIPMENT

    SEDIMENT SAMPLING
        BT: SEAFLOOR SAMPLING
        NT: CORING
        RT: CORE HANDLING
        RT: CORERS
        RT: CORES

    SEDIMENT SORTING
        NT: WINNOWING
        RT: GRAIN SIZE
        RT: SEDIMENT MIXING
        RT: SEDIMENT TRANSPORT

    SEDIMENT STABILITY
        BT: SEDIMENT PROPERTIES
        RT: GEOLOGICAL HAZARDS
        RT: SEDIMENT DYNAMICS
        RT: SETTLEMENT (STRUCTURAL)

    SEDIMENT STRUCTURE
        Notes: Description of adhesive and cementive properties of sediment and sediment permeability and porosity
        BT: SEDIMENT PROPERTIES
        RT: ADHESION
        RT: PERMEABILITY
        RT: POROSITY

    SEDIMENT TEMPERATURE
        Notes: Gradient or temperature fluxes in sediments
        BT: TEMPERATURE
        RT: GEOTHERMAL MEASUREMENT
        RT: HEAT FLOW
        RT: HEAT PROBES

    SEDIMENT TEXTURE
        Notes: Description of particle size of sediments
        BT: SEDIMENT PROPERTIES
        RT: GRAIN ORIENTATION
        RT: GRAIN PACKING
        RT: GRAIN SHAPE

    SEDIMENT TRANSPORT
        NT: EOLIAN TRANSPORT
        NT: FLUVIAL TRANSPORT
        NT: GLACIAL TRANSPORT
        NT: LONGSHORE SEDIMENT TRANSPORT
        NT: MASS GRAVITY TRANSPORT (SEDIMENTS)
        NT: RAFTING
        RT: ALLUVIAL DEPOSITS
        RT: BED LOAD
        RT: BOTTOM CURRENTS

    SEDIMENT TRAPS
        RT: COLLECTING DEVICES
        RT: GEOLOGICAL EQUIPMENT
        RT: OCEANOGRAPHIC EQUIPMENT

    SEDIMENT-WATER EXCHANGES
        RT: GAS EXCHANGE
        RT: HEAT FLOW
        RT: SEDIMENT-WATER INTERFACE

    SEDIMENT-WATER INTERFACE
        Notes: Including chemical or physical phenomena occurring in the sediment-water interface
        BT: INTERFACES
        RT: BED FORMS
        RT: BENTHIC ENVIRONMENT
        RT: GAS EXCHANGE

    SEDIMENTARY BASINS
        RT: BASINS
        RT: SEDIMENTATION
        RT: STRUCTURAL BASINS

    SEDIMENTARY ENVIRONMENTS
        BT: ENVIRONMENTS
        RT: DELTAIC SEDIMENTATION
        RT: ESTUARINE SEDIMENTATION
        RT: FLUVIAL SEDIMENTATION

    SEDIMENTARY ROCKS
        BT: ROCKS
        RT: BEACHROCK
        RT: BENTONITE
        RT: BRECCIA

    SEDIMENTARY STRUCTURES
        Notes: Features that originate within layers of sediments or along the sediment-water interface prior to lithification
        NT: BED FORMS
        NT: BEDDING STRUCTURES
        NT: BIOGENIC SEDIMENTARY STRUCTURES
        NT: BOUDINAGE
        NT: FLOW STRUCTURES
        NT: MUD FLATS
        NT: OLISTOLITHS
        NT: PILLOW STRUCTURES
        NT: SCOUR AND FILL
        NT: SLUMP STRUCTURES
        NT: TURBIDITY CURRENT STRUCTURES
        RT: CONCRETIONS
        RT: GEOLOGICAL STRUCTURES
        RT: NODULES

    SEDIMENTATION
        Notes: Before 1983 search also SEDIMENT DEPOSITION
        NT: DIAGENESIS
        NT: ESTUARINE SEDIMENTATION
        NT: FLUVIAL SEDIMENTATION
        NT: GLACIAL SEDIMENTATION
        NT: INTERTIDAL SEDIMENTATION
        NT: LACUSTRINE SEDIMENTATION
        NT: LAGOONAL SEDIMENTATION
        NT: NEARSHORE SEDIMENTATION
        NT: PELAGIC SEDIMENTATION
        NT: SHELF SEDIMENTATION
        RT: ACCRETION
        RT: ALLUVIAL DEPOSITS
        RT: BIOFACIES

    SEDIMENTOLOGY
        BT: GEOLOGY
        RT: DIAGENESIS
        RT: EROSION
        RT: GEOLOGICAL MAPS

    SEDIMENTS

    SEDIMENTS
        Notes: Use of a more specific term is recommended; consult terms listed below
        NT: ANOXIC SEDIMENTS
        NT: AUTHIGENIC MINERALS
        NT: CHEMICAL SEDIMENTS
        NT: CLASTICS
        NT: COHESIVE SEDIMENTS
        NT: LITTORAL DEPOSITS
        NT: OXIC SEDIMENTS
        NT: PELAGIC SEDIMENTS
        NT: RELICT SEDIMENTS
        NT: TERRIGENOUS SEDIMENTS
        NT: VOLCANOGENIC DEPOSITS
        RT: ACOUSTIC PROPERTIES
        RT: AGGREGATES
        RT: ALLOCHTHONOUS DEPOSITS

    SEED (AQUACULTURE)
        RT: AQUACULTURE PRODUCTS
        RT: AQUACULTURE TECHNIQUES
        RT: BATCH CULTURE

    SEED COLLECTION
        RT: AQUACULTURE
        RT: AQUACULTURE TECHNIQUES
        RT: BOTTOM CULTURE

    SEED PRODUCTION
        Notes: Before 1982 search SEEDING (AQUACULTURE)
        RT: BATCH CULTURE
        RT: HATCHERIES
        RT: MASS CULTURE

    SEEDING (AQUACULTURE)
        RT: AQUACULTURE
        RT: COLONIZATION
        RT: POND CULTURE

    SEEPAGES
        Notes: Use of a more specific term is recommended
        NT: GAS SEEPAGES
        NT: OIL SEEPAGES
        RT: GEOTHERMAL SPRINGS
        RT: HOT SPRINGS
        RT: HYDROTHERMAL SPRINGS

    SEICHES
        BT: SURFACE WATER WAVES
        NT: HARBOUR OSCILLATIONS
        RT: DYNAMICAL OCEANOGRAPHY
        RT: LAKE DYNAMICS
        RT: SEA LEVEL VARIATIONS

    SEINE NETS
        BT: FISHING NETS
        NT: BEACH SEINES
        NT: BOAT SEINES
        RT: COASTAL FISHERIES
        RT: DEMERSAL FISHERIES
        RT: LIGHT FISHING

    SEINERS
        Notes: Any type of vessel used in seining or encircling operations
        BT: FISHING VESSELS
        RT: BOAT SEINES
        RT: COASTAL FISHERIES
        RT: DEMERSAL FISHERIES

    SEINING
        BT: CATCHING METHODS
        NT: PURSE SEINING
        RT: BOAT SEINES
        RT: FISHING
        RT: LAMPARA NETS

    SEISMIC ACTIVITY
        Notes: General phenomena of earth movement and effects on aquatic environment and its exploitation. Before 1983 search also SEISMIC EFFECTS and SEISMICITY
        RT: EARTHQUAKE LOADING
        RT: EARTHQUAKES
        RT: ENVIRONMENTAL FACTORS

    SEISMIC ARRAYS
        BT: ARRAYS
        RT: ACOUSTIC ARRAYS
        RT: GEOPHYSICAL EQUIPMENT
        RT: SEISMIC ENERGY SOURCES

    SEISMIC ATTENUATION
        Notes: seismic wave attenuation
        BT: ATTENUATION
        RT: SEISMIC WAVES

    SEISMIC DATA
        BT: GEOPHYSICAL DATA
        RT: SEISMIC DATA PROCESSING

    SEISMIC DATA PROCESSING
        BT: DATA PROCESSING
        NT: BRIGHT SPOT TECHNOLOGY
        RT: ACOUSTIC HOLOGRAPHY
        RT: CONVOLUTION
        RT: DATA REDUCTION

    SEISMIC DIFFRACTION
        BT: DIFFRACTION
        RT: SEISMIC WAVES

    SEISMIC DISCONTINUITIES
        NT: MOHO
        RT: SEISMIC LAYERS
        RT: SEISMIC VELOCITIES
        RT: SURFACES

    SEISMIC ENERGY SOURCES
        NT: AIR GUNS
        NT: BOOMERS
        NT: EXPLODING WIRE
        NT: GAS EXPLODERS
        NT: SPARKERS
        RT: EXPLOSIVES
        RT: GEOPHYSICAL EQUIPMENT
        RT: SEISMIC ARRAYS

    SEISMIC EQUIPMENT
        BT: GEOPHYSICAL EQUIPMENT
        RT: SEISMIC ARRAYS
        RT: SEISMIC ENERGY SOURCES
        RT: SEISMIC EXPLORATION

    SEISMIC EXPLORATION
        Notes: Before 1983 search also SEISMIC PROFILING
        BT: GEOPHYSICAL EXPLORATION
        NT: SEISMIC REFLECTION PROFILING
        NT: SEISMIC REFRACTION PROFILING
        NT: SUB-BOTTOM PROFILING
        RT: GEOLOGICAL SURVEYS
        RT: SEISMIC ENERGY SOURCES
        RT: SEISMIC EQUIPMENT

    SEISMIC LAYERS
        BT: EARTH STRUCTURE
        NT: LOW-VELOCITY LAYER
        RT: LAYERS
        RT: SEISMIC DISCONTINUITIES
        RT: SEISMIC VELOCITIES

    SEISMIC PROFILES
        BT: ANALOG RECORDS
        NT: SEISMIC REFLECTION PROFILES
        NT: SEISMIC REFRACTION PROFILES
        RT: BRIGHT SPOT TECHNOLOGY
        RT: GEOLOGICAL SECTIONS
        RT: SEISMIC EXPLORATION

    SEISMIC PROPAGATION
        RT: RAY PATHS
        RT: SEISMIC REFLECTION
        RT: SEISMIC REFRACTION

    SEISMIC REFLECTION
        BT: REFLECTION
        RT: SEISMIC PROPAGATION
        RT: SEISMIC REFLECTION PROFILES
        RT: SEISMIC REFLECTION PROFILING

    SEISMIC REFLECTION PROFILES
        BT: SEISMIC PROFILES
        RT: SEISMIC REFLECTION
        RT: SEISMIC REFLECTION PROFILING

    SEISMIC REFLECTION PROFILING
        BT: SEISMIC EXPLORATION
        RT: PROFILING
        RT: SEISMIC REFLECTION
        RT: SEISMIC REFLECTION PROFILES

    SEISMIC REFRACTION
        BT: REFRACTION
        RT: SEISMIC PROPAGATION
        RT: SEISMIC REFRACTION PROFILES
        RT: SEISMIC REFRACTION PROFILING

    SEISMIC REFRACTION PROFILES
        BT: SEISMIC PROFILES
        RT: SEISMIC REFRACTION
        RT: SEISMIC REFRACTION PROFILING
        RT: SEISMIC STRATIGRAPHY

    SEISMIC REFRACTION PROFILING
        BT: SEISMIC EXPLORATION
        RT: PROFILING
        RT: SEISMIC REFRACTION
        RT: SEISMIC REFRACTION PROFILES

    SEISMIC RIDGES
        BT: SUBMARINE RIDGES
        NT: MID-OCEAN RIDGES
        RT: ASEISMIC RIDGES

    SEISMIC SCATTERING
        RT: SEISMIC PROPAGATION
        RT: SEISMIC REFLECTION
        RT: SEISMIC REFRACTION

    SEISMIC STRATIGRAPHY
        BT: STRATIGRAPHY
        RT: SEISMIC PROFILES
        RT: SEISMIC REFRACTION PROFILES
        RT: STRATIGRAPHIC CORRELATION

    SEISMIC VELOCITIES
        BT: VELOCITY
        NT: COMPRESSIONAL WAVE VELOCITIES
        NT: SHEAR WAVE VELOCITIES
        RT: LOW-VELOCITY LAYER
        RT: MOHO
        RT: SEISMIC DISCONTINUITIES

    SEISMIC WAVES
        BT: ELASTIC WAVES
        NT: BODY WAVES
        NT: MICROSEISMS
        NT: SURFACE SEISMIC WAVES
        RT: ACOUSTIC PROPERTIES
        RT: RAY PATHS
        RT: SEISMIC ACTIVITY

    SEISMIC ZONES
        BT: EARTH STRUCTURE
        RT: ASEISMIC ZONES
        RT: BENIOFF ZONE
        RT: SEISMIC ACTIVITY

    SEISMOGRAMS
        BT: ANALOG RECORDS
        RT: SEISMIC WAVES
        RT: SEISMOMETERS

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SEISMOLOGY
        BT: GEOPHYSICS
        RT: ANISOTROPIC ROCKS
        RT: EARTHQUAKES
        RT: EPICENTRES

    SEISMOMETERS
        BT: MEASURING DEVICES
        NT: OCEAN BOTTOM SEISMOMETERS
        NT: STRAIN SEISMOMETERS
        RT: ACCELEROMETERS
        RT: GEOPHYSICAL EQUIPMENT
        RT: SEISMIC EQUIPMENT

    SELECTED SHIPS
        Notes: Merchant vessels equipped to make basic meteorological and oceanographic observations
        BT: MERCHANT SHIPS
        RT: INSTRUMENT PLATFORMS
        RT: METEOROLOGICAL DATA
        RT: METEOROLOGICAL OBSERVATIONS

    SELECTIVE BREEDING
        BT: BREEDING
        RT: AQUACULTURE TECHNIQUES
        RT: BREEDING PONDS
        RT: BROOD STOCKS

    SELECTIVE FEEDING
        Notes: Added in 1980
        BT: ARTIFICIAL FEEDING
        RT: DIETS
        RT: FEED
        RT: FOOD ORGANISMS

    SELENIUM
        BT: CHEMICAL ELEMENTS
        RT: SELENIUM COMPOUNDS
        RT: SELENIUM ISOTOPES
        RT: TRACE ELEMENTS

    SELENIUM COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: SELENIUM

    SELENIUM ISOTOPES
        BT: ISOTOPES
        RT: SELENIUM

    SELF FERTILIZATION
        BT: HERMAPHRODITISM
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: PROTANDRY
        RT: SEXUAL REPRODUCTION

    SELF-PROPELLED VEHICLES
        BT: UNDERWATER VEHICLES
        RT: FREE-SWIMMING VEHICLES
        RT: PROPULSION SYSTEMS
        RT: SEABED VEHICLES

    SELF PURIFICATION
        Notes: Natural self purification of waters, sediments, organisms etc.
        RT: AERATION
        RT: AEROBIC BACTERIA
        RT: BIOCHEMICAL OXYGEN DEMAND

    SEMEN
        Notes: Added in 1980
        RT: SECRETORY PRODUCTS
        RT: SPERM
        RT: TESTES

    SEMI-ENCLOSED SEAS
        BT: MARGINAL SEAS
        RT: EMBAYMENTS
        RT: SHELF DYNAMICS
        RT: SHELF SEAS

    SEMIDIURNAL TIDES
        BT: TIDES

    SEMISUBMERSIBLE PLATFORMS
        Notes: Towed or self-propelled structures partially submerged by flooding. Before 1982 search SEMISUBMERSIBLES
        BT: MOBILE PLATFORMS
        RT: ANCHORING
        RT: DYNAMIC POSITIONING
        RT: SHIP MOORING SYSTEMS

    SENSE FUNCTIONS
        NT: AUDITION
        NT: OLFACTION
        NT: PHOTORECEPTION
        NT: TACTILE FUNCTIONS
        NT: TASTE FUNCTIONS
        NT: VISION
        RT: ANIMAL APPENDAGES
        RT: ANTENNAE
        RT: CHEMORECEPTION

    SENSE ORGANS
        BT: ANIMAL ORGANS
        NT: AUDITORY ORGANS
        NT: BALANCE ORGANS
        NT: CHEMORECEPTORS
        NT: LATERAL LINE
        NT: MECHANORECEPTORS
        NT: OLFACTORY ORGANS
        NT: PHOTORECEPTORS
        NT: TACTILE ORGANS
        NT: TASTE ORGANS
        RT: ANATOMY
        RT: CENTRAL NERVOUS SYSTEM
        RT: KINESIS

    SENSE TENTACLES
        BT: TENTACLES
        RT: SENSE ORGANS

    SENSIBLE HEAT
        BT: HEAT
        RT: AIR-WATER EXCHANGES
        RT: HEAT CONDUCTION
        RT: SENSIBLE HEAT TRANSFER

    SENSIBLE HEAT TRANSFER
        Notes: Sensible heat flux across air-water interface and air-ice interface
        BT: HEAT EXCHANGE
        RT: AIR-ICE INTERFACE
        RT: AIR-WATER INTERFACE
        RT: BOWEN RATIO

    SENSORS
        BT: ELECTRONIC EQUIPMENT
        NT: TOWED SENSORS
        RT: CONDUCTIVITY SENSORS
        RT: FLOWMETERS
        RT: LIGHT MEASURING INSTRUMENTS

    SEPARATION
        NT: CENTRIFUGATION
        NT: CHEMICAL EXTRACTION
        NT: CHEMICAL PRECIPITATION
        NT: DECANTATION
        NT: DESICCATION
        NT: FLOTATION
        NT: GAS OIL SEPARATION
        NT: GAS WATER SEPARATION
        NT: OIL WATER SEPARATION
        RT: ADSORPTION
        RT: AERATION
        RT: ANIMAL OIL EXTRACTION

    SEPARATION PROCESSES
        Notes: Before 1982 search also SEPARATION
        NT: DEMINERALIZATION
        NT: DIALYSIS
        NT: DISSOLUTION
        NT: DISTILLATION
        NT: ION EXCHANGE
        NT: LEACHING
        NT: OSMOSIS
        NT: SOLVENT EXTRACTION
        RT: OIL TREATING

    SEPIOLITE
        BT: SILICATE MINERALS

    SEPTICAEMIA
        Notes: Added in 1980
        BT: INFECTIOUS DISEASES
        RT: FISH DISEASES
        RT: HAEMATOLOGICAL DISEASES
        RT: VIRAL DISEASES

    SERINE
        BT: AMINO ACIDS

    SEROLOGICAL STUDIES
        RT: ANTIBODIES
        RT: ANTIGENS
        RT: BIOPOLYMORPHISM

    SEROLOGICAL TAXONOMY
        BT: TAXONOMY
        RT: ANTIBODIES
        RT: ELECTROPHORESIS
        RT: PROTEINS

    SERPENTINITE
        BT: METAMORPHIC ROCKS
        RT: SERPENTINITIZATION

    SERPENTINITIZATION
        RT: HYDROTHERMAL ALTERATION
        RT: METASOMATISISM
        RT: METASOMATISM

    SERUM
        BT: BODY FLUIDS
        NT: ANTIBODIES
        RT: HAEMATOLOGY
        RT: SEROLOGICAL STUDIES
        RT: SEROLOGICAL TAXONOMY

    SESSILE SPECIES
        BT: SPECIES
        RT: BENTHOS
        RT: SEDENTARY SPECIES
        RT: SUBSTRATA

    SESTON
        BT: AQUATIC COMMUNITIES
        RT: PLANKTON
        RT: SUSPENDED PARTICULATE MATTER

    SETTLEMENT (STRUCTURAL)
        RT: COMPACTION
        RT: FAILURES
        RT: FOUNDATIONS

    SETTLING BEHAVIOUR
        BT: BEHAVIOUR
        RT: ALGAL SETTLEMENTS
        RT: ARTIFICIAL SUBSTRATA
        RT: BIOLOGICAL SETTLEMENT

    SETTLING RATE
        BT: VELOCITY
        RT: PARTICLE MOTION
        RT: PARTICLE SETTLING
        RT: PARTICULATE FLUX

    SEWAGE
        Notes: Before 1982 search also SEWAGE EFFLUENTS
        BT: WASTES
        RT: BIOAERATION
        RT: CHEMICAL POLLUTION
        RT: DETERGENTS

    SEWAGE DISPOSAL
        Notes: Added in 1980
        BT: WASTE DISPOSAL
        RT: INDUSTRIAL WASTES
        RT: OUTFALLS
        RT: RADIOACTIVE WASTES

    SEWAGE PONDS
        BT: PONDS
        RT: BIODEGRADATION
        RT: DECANTATION TANKS
        RT: POND CONSTRUCTION

    SEWAGE TREATMENT
        BT: WASTE TREATMENT
        RT: AERATION
        RT: BIODEGRADATION
        RT: CHEMICAL DEGRADATION

    SEX
        Notes: Added in 1980
        NT: FEMALES
        NT: MALES
        RT: SEX CHARACTERS
        RT: SEX DETERMINATION
        RT: SEX HORMONES

    SEX CHARACTERS
        Notes: Added in 1980
        NT: SECONDARY SEXUAL CHARACTERS
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: FEMALES
        RT: MALES

    SEX DETERMINATION
        Notes: Physiological mechanisms determining sex
        RT: CHROMOSOMES
        RT: HERMAPHRODITISM
        RT: SEX

    SEX HORMONES
        Notes: Any hormone having a morphological or physiological effect upon the reproductive organs, secondary sex characters or sexual behaviour. Added in 1980
        BT: HORMONES
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: SECONDARY SEXUAL CHARACTERS
        RT: SEX

    SEX RATIO
        BT: POPULATION STRUCTURE
        RT: FEMALES
        RT: MALES
        RT: REPRODUCTIVE BEHAVIOUR

    SEX REVERSAL
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: SEX
        RT: SEX DETERMINATION

    SEXUAL BEHAVIOUR
        BT: BEHAVIOUR
        RT: REPRODUCTIVE BEHAVIOUR
        RT: SEX
        RT: SEX HORMONES

    SEXUAL CELLS
        BT: CELLS
        NT: EGGS
        NT: SPERM
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: BIOLOGICAL FERTILIZATION
        RT: BREEDING

    SEXUAL DIMORPHISM
        RT: BIOPOLYMORPHISM
        RT: ORGANISM MORPHOLOGY
        RT: SECONDARY SEXUAL CHARACTERS

    SEXUAL ISOLATION
        Notes: Added in 1980
        BT: ISOLATING MECHANISMS
        RT: BREEDING SEASONS
        RT: SEX
        RT: SEXUAL SELECTION

    SEXUAL MATURITY
        BT: BIOLOGICAL PROPERTIES
        RT: ADULTS
        RT: BREEDING
        RT: EYESTALK EXTIRPATION

    SEXUAL REPRODUCTION
        Notes: Natural or artificial sexual reproduction
        BT: REPRODUCTION
        NT: BIOLOGICAL FERTILIZATION
        NT: PARTURITION
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: BREEDING
        RT: BREEDING SITES

    SEXUAL SELECTION
        Notes: Added in 1980
        BT: BIOSELECTION
        RT: EVOLUTION
        RT: SEX
        RT: SEXUAL DIMORPHISM

    SHALE
        BT: CLASTICS
        NT: OIL SHALE
        RT: LUTITES
        RT: SEDIMENTARY ROCKS

    SHALLOW WATER
        RT: CONTINENTAL SHELVES
        RT: DEEP WATER
        RT: LAGOONS

    SHALLOW-WATER TIDES
        BT: TIDES
        RT: ESTUARINE TIDES
        RT: QUARTER DIURNAL TIDES
        RT: SHALLOW WATER

    SHALLOW-WATER WAVES
        BT: WATER WAVES
        NT: CNOIDAL WAVES
        NT: SOLITARY WAVES
        NT: TIDAL BORES
        RT: NONLINEAR WAVES
        RT: SHALLOW WATER
        RT: STORM SURGES

    SHAPE
        Notes: Used only as a qualifier
        NT: GRAIN SHAPE
        RT: CONTOURS
        RT: DEFORMATION
        RT: DIMENSIONS

    SHAPED CHARGES
        BT: EXPLOSIVES

    SHARED STOCKS
        Notes: Stocks of associated species occurring within the EEZ of two or more coastal states. Added in 1982
        BT: STOCKS
        RT: ALLOCATION SYSTEMS
        RT: EXCLUSIVE ECONOMIC ZONE
        RT: FISHERY POLICY

    SHARK ATTACKS
        BT: DIVING HAZARDS
        RT: BATHING
        RT: DIVING
        RT: FISH REPELLENTS

    SHARK FISHERIES
        Notes: Added in 1982
        BT: FINFISH FISHERIES
        RT: MARINE FISHERIES

    SHARK UTILIZATION
        Notes: Added in 1982
        BT: UTILIZATION
        RT: FISH MEAL
        RT: FISH OILS
        RT: HUMAN FOOD

    SHEAR
        NT: CURRENT SHEAR
        NT: VERTICAL SHEAR
        NT: WIND SHEAR
        RT: DYNAMIC VISCOSITY
        RT: SHEAR FLOW
        RT: SHEAR MODULUS

    SHEAR FLOW
        BT: FLUID FLOW
        NT: STRATIFIED SHEAR FLOW
        NT: TURBULENT SHEAR FLOW
        RT: DYNAMIC VISCOSITY
        RT: MIXING LENGTH
        RT: RICHARDSON NUMBER

    SHEAR MODULUS
        BT: ELASTIC CONSTANTS
        RT: BULK MODULUS
        RT: ELASTICITY
        RT: MECHANICAL PROPERTIES

    SHEAR PROBES
        BT: PROFILERS
        RT: CURRENT MEASURING EQUIPMENT
        RT: CURRENT SHEAR
        RT: FLOWMETERS

    SHEAR STRENGTH
        BT: STRENGTH
        RT: BEARING CAPACITY
        RT: COHESIVE SEDIMENTS
        RT: FLUIDIZATION

    SHEAR STRESS
        BT: STRESS
        RT: BOTTOM STRESS
        RT: COUETTE FLOW
        RT: DYNAMIC VISCOSITY

    SHEAR WAVE VELOCITIES
        BT: SEISMIC VELOCITIES
        RT: S-WAVES
        RT: SEDIMENT PROPERTIES

    SHEAR ZONE
        RT: FAULTS
        RT: ORES

    SHELF CURRENTS
        BT: WATER CURRENTS
        RT: OCEAN CURRENTS
        RT: SHELF DYNAMICS
        RT: SHELF WAVES

    SHELF DYNAMICS
        BT: WATER CIRCULATION
        NT: BAY DYNAMICS
        NT: ESTUARINE DYNAMICS
        NT: FJORD DYNAMICS
        NT: NEARSHORE DYNAMICS
        NT: SHELF EDGE DYNAMICS
        RT: COASTAL COUNTERCURRENTS
        RT: COASTAL JETS
        RT: COASTAL OCEANOGRAPHY

    SHELF EDGE
        BT: SUBMARINE FEATURES
        RT: CONTINENTAL SHELVES
        RT: CONTINENTAL SLOPE
        RT: SHELF EDGE DYNAMICS

    SHELF EDGE DYNAMICS
        BT: SHELF DYNAMICS
        RT: SHELF EDGE
        RT: SHELF FRONTS
        RT: SLOPE PROCESSES

    SHELF EDGE FRONTS
        BT: SHELF FRONTS
        RT: CONTINENTAL SHELVES
        RT: SHELF DYNAMICS
        RT: SHELF EDGE

    SHELF FACIES
        BT: FACIES
        RT: SHELF SEAS
        RT: SHELF SEDIMENTATION

    SHELF FRONTS
        BT: OCEANIC FRONTS
        NT: SHELF EDGE FRONTS
        RT: SHELF DYNAMICS
        RT: SHELF EDGE DYNAMICS
        RT: SHELF SEAS

    SHELF GEOLOGY
        BT: MARINE GEOLOGY
        RT: BED LOAD
        RT: CONTINENTAL SHELVES
        RT: SEDIMENT TRANSPORT
     

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SHELF SEAS
        BT: MARGINAL SEAS
        RT: BOTTOM CURRENTS
        RT: CONTINENTAL SHELVES
        RT: SEMI-ENCLOSED SEAS

    SHELF SEDIMENTATION
        BT: SEDIMENTATION
        RT: BED LOAD
        RT: CONTINENTAL SHELVES
        RT: SEDIMENT TRANSPORT

    SHELF WAVES
        BT: TRAPPED WAVES
        RT: NONLINEAR WAVES
        RT: SHELF CURRENTS
        RT: SHELF DYNAMICS

    SHELLFISH
        Notes: Common category which includes shelled molluscs and crustaceans, especially those used as human food
        RT: BOTULISM
        RT: COMMERCIAL SPECIES
        RT: FISHERY RESOURCES

    SHELLFISH CATCH STATISTICS
        Notes: Catch tabulation in number or weight of shellfish species
        BT: CATCH STATISTICS
        RT: BY CATCH
        RT: FRESHWATER CRUSTACEANS
        RT: FRESHWATER MOLLUSCS

    SHELLFISH CULTURE
        BT: AQUACULTURE
        NT: CRUSTACEAN CULTURE
        NT: MOLLUSC CULTURE
        RT: BOTTOM CULTURE
        RT: BRACKISHWATER AQUACULTURE
        RT: CULTURE TANKS

    SHELLFISH FISHERIES
        BT: FISHERIES
        NT: ECHINODERM FISHERIES
        NT: MOLLUSC FISHERIES
        RT: FRESHWATER CRUSTACEANS
        RT: FRESHWATER MOLLUSCS
        RT: MARINE CRUSTACEANS

    SHELLS
        Notes: Description and composition of exoskeletons of different shellfish species and their use as commercial products
        BT: ANIMAL PRODUCTS
        RT: BRACKISHWATER MOLLUSCS
        RT: CALCIFICATION
        RT: CONCHOLOGY

    SHELTERED HABITATS
        Notes: Added in 1980
        BT: HABITAT
        RT: ECOLOGICAL ZONATION
        RT: EXPOSURE TOLERANCE

    SHELTERS
        Notes: Natural or artificial underwater shelters made for improvement of the habitat or for fishing purposes
        RT: AQUACULTURE
        RT: ARTIFICIAL REEFS
        RT: ARTIFICIAL SPAWNING GROUNDS

    SHINGLE
        BT: CLASTICS
        RT: BEACH ACCRETION
        RT: BEACH RIDGES
        RT: PEBBLES

    SHIP CANALS
        BT: CANALS
        RT: HARBOURS
        RT: INTEROCEAN CANALS
        RT: NAVIGATIONAL CHANNELS

    SHIP DESIGN
        BT: DESIGN
        RT: HULLS
        RT: SHIP HULLS
        RT: SHIP MODELS

    SHIP DRIFT
        BT: DRIFT
        RT: DEAD RECKONING
        RT: LAGRANGIAN CURRENT MEASUREMENT
        RT: STATION KEEPING

    SHIP HANDLING
        RT: HANDLING
        RT: MANOEUVRABILITY
        RT: NAVIGATION

    SHIP HULLS
        BT: HULLS
        RT: CATAMARANS
        RT: FOULING CONTROL
        RT: SHIP DESIGN

    SHIP LOSSES
        RT: CAPSIZING
        RT: COLLISIONS
        RT: FIRE

    SHIP MODELS
        BT: SCALE MODELS
        RT: SHIP DESIGN
        RT: SHIP STABILITY
        RT: SHIP TECHNOLOGY

    SHIP MOORING SYSTEMS
        Notes: To include systems for fixed and mobile platforms
        BT: MOORING SYSTEMS
        NT: SINGLE POINT MOORINGS
        RT: ANCHORING
        RT: BERTHING
        RT: FENDERS

    SHIP MOTION
        NT: CAPSIZING
        NT: HEAVING
        NT: PITCHING
        NT: RIGHTING
        NT: ROLLING
        NT: SURGING
        NT: SWAYING
        NT: YAWING
        RT: HEAVE COMPENSATORS
        RT: MOTION
        RT: SEA SICKNESS

    SHIP PERFORMANCE
        RT: SHIP DESIGN
        RT: SHIP SPEED
        RT: SHIP STABILITY

    SHIP ROUTEING
        NT: ICE ROUTEING
        RT: HURRICANES
        RT: NAVIGATION
        RT: WAVE FORECASTING

    SHIP SPEED
        BT: VELOCITY
        RT: LOGBOOKS
        RT: NAVIGATION
        RT: SHIP PERFORMANCE

    SHIP STABILITY
        BT: STABILITY
        RT: CAPSIZING
        RT: ICING
        RT: LIFEBOATS

    SHIP TECHNOLOGY
        Notes: Restrict use to publications concerned with general aspects of the design and construction of vessels and propulsion systems. Before 1982 search SHIPBUILDING, MARINE ENGINEERING and NAVAL ARCHITECTURE
        BT: TECHNOLOGY
        RT: ARTIFICIAL HARBOURS
        RT: DEFENCE CRAFT
        RT: ENGINEERING

    SHIPBOARD ANALYSIS
        Notes: Use for analysis aboard research vessels
        BT: WATER ANALYSIS
        RT: ANALYSIS
        RT: ANALYTICAL TECHNIQUES

    SHIPBOARD EQUIPMENT
        BT: EQUIPMENT
        RT: DIESEL ENGINES
        RT: PROPULSION SYSTEMS
        RT: THRUSTERS

    SHIPPING
        Notes: Use only as a collective term in the context of transportation, navigation, traffic on high seas, trade, commerce, maritime law, etc.
        RT: CERTIFICATION
        RT: DEFENCE CRAFT
        RT: MARITIME LEGISLATION

    SHIPPING LANES
        Notes: Routes used by merchant vessels
        RT: MARINE TRANSPORTATION
        RT: MERCHANT SHIPS
        RT: SELECTED SHIPS

    SHIPPING NOISE
        BT: AMBIENT NOISE
        RT: SURFACE NOISE

    SHIPS
        Notes: Use of a more specific term is recommended. See also SURFACE CRAFT
        BT: SURFACE CRAFT
        NT: CABLE SHIPS
        NT: LIGHTERS
        NT: LIGHTSHIPS
        NT: MERCHANT SHIPS
        NT: MOTOR BOATS
        NT: PROTECTION VESSELS
        NT: SAILING SHIPS
        NT: SUPPLY BOATS
        NT: SUPPORT SHIPS
        NT: TUGS
        NT: WEATHER SHIPS
        RT: COLLISION AVOIDANCE
        RT: GROUNDINGS
        RT: ICING

    SHOALING
        RT: BEACH CUSPS
        RT: SEDIMENT TRANSPORT
        RT: SHOALS

    SHOALING WAVES
        RT: BEACH CUSPS
        RT: BREAKING WAVES
        RT: ROLLERS

    SHOALS
        Notes: Submerged ridges, banks, bars and reefs constituting a danger for navigation
        BT: SUBMARINE FEATURES
        RT: BANKS (TOPOGRAPHY)
        RT: COASTAL WATERS
        RT: COASTS

    SHORAN
        BT: RADIO NAVIGATION

    SHORE PROTECTION
        BT: COASTAL ZONE MANAGEMENT
        RT: ARTIFICIAL SEAWEED
        RT: BEACH EROSION
        RT: COAST DEFENCES

    SHORT-CRESTED WAVES
        BT: SURFACE WATER WAVES
        RT: DIRECTIONAL SPECTRA
        RT: LONG-CRESTED WAVES
        RT: WAVE CRESTS

    SHORT-TERM CHANGES
        BT: TEMPORAL VARIATIONS
        RT: LONG-TERM CHANGES
        RT: PREDICTION
        RT: SHORT-TERM RECORDS

    SHORT-TERM PLANNING
        Notes: Added in 1980
        BT: PLANNING
        RT: LONG-TERM PLANNING

    SHORT-TERM RECORDS
        RT: SHORT-TERM CHANGES

    SHORT WAVE-LONG WAVE INTERACTIONS
        BT: WAVE-WAVE INTERACTION
        RT: SURFACE WATER WAVES

    SHRIMP CULTURE
        Notes: Before 1982 search CRUSTACEAN CULTURE
        BT: CRUSTACEAN CULTURE
        RT: BRACKISHWATER AQUACULTURE
        RT: COASTAL LAGOONS
        RT: CULTURE TANKS

    SHRIMP FISHERIES
        Notes: Added in 1982
        BT: CRUSTACEAN FISHERIES
        RT: DEMERSAL FISHERIES
        RT: LAGOON FISHERIES
        RT: MARINE FISHERIES

    SIAL
        BT: EARTH CRUST
        RT: CONTINENTAL CRUST
        RT: SIMA

    SIBLING SPECIES
        BT: SPECIES
        RT: EVOLUTION
        RT: GENETICS

    SIDE SCAN SONAR
        BT: ACTIVE SONAR
        RT: GLORIA
        RT: SEAFLOOR MAPPING
        RT: SONOGRAPHS

    SIDERITE
        BT: CARBONATE MINERALS

    SIGMA-T
        BT: WATER DENSITY
        RT: ATMOSPHERIC PRESSURE
        RT: DENSITY
        RT: DENSITY SECTIONS

    SIGNAL PROCESSING
        BT: DATA PROCESSING
        RT: FOURIER ANALYSIS
        RT: SPECTRAL ANALYSIS
        RT: TELEMETRY

    SIGNAL-TO-NOISE RATIO
        RT: ATTENUATION
        RT: ELECTRONIC NOISE
        RT: IMAGE ENHANCEMENT

    SIGNIFICANT WAVE HEIGHT
        BT: WAVE HEIGHT
        RT: OFFSHORE STRUCTURES
        RT: WAVE FORECASTING

    SIGNIFICANT WAVES
        BT: SURFACE WATER WAVES
        RT: WAVE HEIGHT
        RT: WAVE PERIOD

    SILICA
        BT: SILICON COMPOUNDS
        RT: CHERTS
        RT: CRISTOBALITE
        RT: SILICEOUS OOZE

    SILICATE MINERALS
        BT: MINERALS
        NT: AMPHIBOLES
        NT: ANDALUSITE
        NT: CLAY MINERALS
        NT: FELDSPARS
        NT: GARNET
        NT: KYANITE
        NT: MICAS
        NT: OLIVINE
        NT: OPAL
        NT: PYROPHYLLITE
        NT: PYROXENES
        NT: QUARTZ
        NT: QUARTZITE
        NT: SEPIOLITE
        NT: TITANITE
        NT: TOURMALINE
        NT: ZEOLITES
        NT: ZIRCON
        RT: SILICATES

    SILICATES
        BT: SILICON COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: IRON SILICATES
        RT: MAGNESIUM SILICATES

    SILICEOUS OOZE
        BT: OOZES
        NT: DIATOM OOZE
        NT: RADIOLARIAN OOZE
        RT: SILICA
        RT: SILICEOUS SEDIMENTS

    SILICEOUS ROCKS
        NT: CHERTS
        NT: DIATOMITES
        NT: PORCELLANITE
        NT: RADIOLARITE
        RT: SANDSTONE
        RT: SEDIMENTARY ROCKS
        RT: SILICEOUS SEDIMENTS

    SILICEOUS SEDIMENTS
        BT: BIOGENIC DEPOSITS
        RT: CHEMICAL SEDIMENTS
        RT: FLINT
        RT: PELAGIC SEDIMENTS

    SILICIC ACID
        BT: INORGANIC ACIDS
        RT: SILICATES
        RT: SILICON COMPOUNDS

    SILICIFICATION
        RT: CHERTIFICATION
        RT: DIAGENESIS
        RT: METASOMATISM

    SILICON
        BT: CHEMICAL ELEMENTS
        RT: SILICATES
        RT: SILICON COMPOUNDS
        RT: SILICON CYCLE

    SILICON COMPOUNDS
        NT: SILICA
        NT: SILICATES
        RT: ALUMINIUM COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: NUTRIENTS (MINERAL)

    SILICON CYCLE
        BT: NUTRIENT CYCLES
        RT: CHEMICAL CYCLES
        RT: SILICON
        RT: SILICON COMPOUNDS

    SILICON ISOTOPES
        BT: ISOTOPES
        RT: SILICON

    SILL DEPTH
        BT: DEPTH
        RT: FJORDS
        RT: SILLS

    SILLS
        BT: SUBMARINE FEATURES
        RT: FJORDS
        RT: RELIEF FORMS
        RT: RIDGES

    SILO CULTURE
        Notes: Added in 1982
        BT: AQUACULTURE TECHNIQUES
        RT: FISH CULTURE
        RT: INTENSIVE CULTURE

    SILT
        BT: CLASTICS
        RT: COHESIONLESS SEDIMENTS
        RT: FLUIDIZED SEDIMENT FLOW
        RT: LUTITES

    SILT METERS
        RT: SEDIMENT TRAPS
        RT: SILT

    SILTING
        BT: DEPOSITION
        RT: NAVIGATIONAL CHANNELS
        RT: SEDIMENTATION
        RT: SILT

    SILTSTONE
        BT: CLASTICS
        RT: LUTITES
        RT: MUDSTONE
        RT: SEDIMENTARY ROCKS

    SILURIAN
        Notes: Before 1982 search SILURIAN PERIOD
        BT: PALAEOZOIC

    SILVER
        BT: CHEMICAL ELEMENTS
        RT: FERROMANGANESE NODULES
        RT: HEAVY METALS
        RT: HOT BRINES

    SILVER COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: SILVER

    SILVER ISOTOPES
        BT: ISOTOPES
        RT: SILVER

    SIMA
        BT: EARTH CRUST
        RT: OCEANIC CRUST
        RT: SIAL

    SIMULATION
        Notes: Used only as a qualifier
        RT: GAME THEORY
        RT: MODELLING
        RT: OPERATIONS RESEARCH

    SIMULATORS
        RT: MODELS
        RT: SIMULATION
        RT: TRAINING AIDS

    SINGLE CELL PROTEINS
        Notes: Added in 1982
        BT: PROTEINS
        RT: ARTIFICIAL FEEDING
        RT: BACTERIA
        RT: DIETS

    SINGLE POINT MOORINGS
        Notes: Restricted to ships
        BT: SHIP MOORING SYSTEMS
        RT: ARTICULATED COLUMNS
        RT: LOADING BUOYS
        RT: TANKER LOADING

    SINKING
        Notes: Added in 1982
        RT: COLLISIONS
        RT: PLANKTON
        RT: SUSPENDED PARTICULATE MATTER

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SITE SELECTION
        Notes: Site selection and evaluation for aquaculture purposes, siting of power plants, fishing harbours etc. Added in 1980
        BT: EVALUATION
        RT: AQUACULTURE FACILITIES
        RT: AQUACULTURE TECHNIQUES
        RT: ARTIFICIAL HARBOURS

    SITE SURVEYS
        Notes: Before 1986 search also SITE INVESTIGATION
        BT: SURVEYS
        RT: BOTTOM PHOTOGRAPHS
        RT: DEEP-SEA MINING
        RT: DRILLING

    SITOSTEROLS
        BT: STEROLS

    SIZE
        Notes: Used only as a qualifier
        BT: DIMENSIONS
        NT: PARTICLE SIZE
        RT: AREA
        RT: SHAPE
        RT: SIZE DISTRIBUTION

    SIZE DISTRIBUTION
        Notes: Length and weight frequencies
        BT: POPULATION STRUCTURE
        RT: AGE COMPOSITION
        RT: LENGTH-WEIGHT RELATIONSHIPS
        RT: SIZE

    SIZE-LIMIT REGULATIONS
        BT: FISHERY REGULATIONS
        RT: MESH REGULATIONS

    SKELETON
        BT: MUSCULOSKELETAL SYSTEM
        NT: ENDOSKELETON
        NT: EXOSKELETON
        RT: ANATOMY
        RT: CARTILAGE
        RT: OSTEOLOGY

    SKEWNESS
        Notes: Used only as a qualifier
        RT: COEFFICIENTS
        RT: KURTOSIS
        RT: STATISTICAL ANALYSIS

    SKIN
        RT: BODY WALLS
        RT: EPITHELIA

    SKULL
        BT: BONES
        RT: BRAIN
        RT: HEAD
        RT: OTOLITHS

    SLATES
        RT: ARGILLACEOUS SEDIMENTS
        RT: CHLORITE
        RT: METAMORPHIC ROCKS

    SLICKS
        NT: WINDROWS
        RT: MONOMOLECULAR FILMS
        RT: OIL SLICKS
        RT: SURFACE FILMS

    SLIDES
        BT: MASS MOVEMENT
        NT: LANDSLIDES
        RT: CREEP
        RT: SLUMPING

    SLIDES (PHOTOGRAPHIC)
        BT: AUDIOVISUAL MATERIAL
        RT: FILMSTRIPS
        RT: GRAPHICS

    SLOPE CURRENTS
        BT: WATER CURRENTS

    SLOPE ENVIRONMENT
        RT: CONTINENTAL SLOPE

    SLOPE INDICATORS
        BT: MEASURING DEVICES
        NT: INCLINOMETERS
        NT: TILTMETERS
        NT: WIRE ANGLE INDICATORS
        RT: GRADIENTS

    SLOPE PROCESSES
        RT: CASCADING
        RT: SHELF EDGE DYNAMICS

    SLOPE STABILITY
        BT: STABILITY
        RT: COHESIONLESS SEDIMENTS
        RT: COHESIVE SEDIMENTS
        RT: CREEP

    SLOPE WATER
        BT: WATER MASSES

    SLOPES (TOPOGRAPHY)
        RT: CONTINENTAL SLOPE
        RT: GRADIENTS
        RT: ISLAND SLOPE

    SLUDGE
        BT: WASTES
        RT: BIOAERATION
        RT: MUD
        RT: ORGANIC WASTES

    SLUDGE TREATMENT
        BT: WASTE TREATMENT
        RT: AERATION
        RT: BIODEGRADATION
        RT: CHEMICAL DEGRADATION

    SLUMP STRUCTURES
        BT: SEDIMENTARY STRUCTURES
        RT: OLISTOLITHS
        RT: OLISTOSTROMES
        RT: SLOPE STABILITY

    SLUMPING
        BT: MASS GRAVITY TRANSPORT (SEDIMENTS)
        RT: CONTINENTAL SLOPE
        RT: CREEP
        RT: EARTHQUAKES

    SLURRIES
        RT: MUD
        RT: PUMPING
        RT: SUSPENSION

    SMALL SCALE AQUACULTURE
        Notes: Added in 1982
        BT: AQUACULTURE SYSTEMS
        RT: AQUACULTURE DEVELOPMENT
        RT: FISH PONDS
        RT: SOCIOLOGICAL ASPECTS

    SMECTITE
        BT: CLAY MINERALS

    SMOKE
        RT: AIR POLLUTION
        RT: ATMOSPHERIC PARTICULATES
        RT: FIRE

    SMOLTS
        RT: JUVENILES

    SNOW
        BT: ATMOSPHERIC PRECIPITATIONS
        RT: HAIL
        RT: ICE
        RT: RAINFALL

    SOAPS
        BT: DETERGENTS
        RT: CHEMICAL POLLUTANTS
        RT: CHEMICAL POLLUTION
        RT: DOMESTIC WASTES

    SOCIAL BEHAVIOUR
        BT: BEHAVIOUR
        NT: DOMINANCE HIERARCHIES
        NT: SCHOOLING BEHAVIOUR
        RT: CETOLOGY
        RT: ECOLOGICAL AGGREGATIONS
        RT: GROUP EFFECTS

    SOCIOLOGICAL ASPECTS
        RT: DEVELOPMENT PROJECTS
        RT: ECONOMICS
        RT: EDUCATION

    SODAR
        Notes: SOnic Detection And Rangefinding in the atmosphere
        RT: ACOUSTIC IMAGERY
        RT: LIDAR
        RT: METEOROLOGICAL INSTRUMENTS

    SODIUM
        BT: CHEMICAL ELEMENTS
        RT: ALKALI METALS
        RT: SODIUM COMPOUNDS
        RT: SODIUM ISOTOPES

    SODIUM CHLORIDE
        BT: SODIUM COMPOUNDS
        RT: CHLORIDES
        RT: DISSOLVED CHEMICALS
        RT: EVAPORITES

    SODIUM COMPOUNDS
        BT: ALKALINE EARTH METAL COMPOUNDS
        NT: SODIUM CHLORIDE
        RT: ALKALI METAL COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: DISSOLVED SALTS

    SODIUM ISOTOPES
        BT: ISOTOPES
        RT: SODIUM

    SOFAR
        Notes: SOund Fixing And Rangefinding
        BT: POSITION FIXING
        RT: SOFAR CHANNEL
        RT: SOFAR FLOATS
        RT: SOUND CHANNELS

    SOFAR CHANNEL
        BT: SOUND CHANNELS
        RT: PERMANENT THERMOCLINE
        RT: SOFAR
        RT: SOFAR FLOATS

    SOFAR FLOATS
        BT: SWALLOW FLOATS
        RT: SOFAR
        RT: SOFAR CHANNEL

    SOIL CONSERVATION
        BT: CONSERVATION
        RT: COASTAL EROSION
        RT: EROSION
        RT: EROSION CONTROL

    SOIL EROSION
        BT: EROSION
        RT: EROSION CONTROL
        RT: SOIL CONSERVATION
        RT: SOILS

    SOIL MECHANICS
        BT: MECHANICS
        RT: COHESIVE SEDIMENTS
        RT: COMPACTION
        RT: CONSOLIDATION

    SOILS
        RT: AGRICULTURE
        RT: EROSION
        RT: GEOLOGY

    SOLAR ACTIVITY
        RT: ASTRONOMY
        RT: LONG-TERM CHANGES
        RT: SOLAR CONSTANT

    SOLAR CELLS
        BT: ELECTRIC POWER SOURCES
        RT: SOLAR POWER
        RT: SOLAR RADIATION
        RT: SUN

    SOLAR CONSTANT
        RT: CLIMATIC CHANGES
        RT: CONSTANTS
        RT: EXTRATERRESTRIAL RADIATION

    SOLAR DIURNAL TIDES
        BT: SOLAR TIDES
        RT: SUN
        RT: TIDAL CONSTITUENTS

    SOLAR ECLIPSE
        RT: ASTRONOMY
        RT: LIGHT
        RT: SOLAR RADIATION

    SOLAR POWER
        BT: ENERGY RESOURCES
        RT: POWER FROM THE SEA
        RT: RENEWABLE RESOURCES
        RT: SOLAR CELLS

    SOLAR RADIATION
        BT: ELECTROMAGNETIC RADIATION
        NT: EXTRATERRESTRIAL RADIATION
        NT: REFLECTED GLOBAL RADIATION
        RT: ACTINOMETERS
        RT: AIR-WATER INTERFACE
        RT: ALBEDO

    SOLAR SEMIDIURNAL TIDES
        BT: SOLAR TIDES
        RT: SUN
        RT: TIDAL CONSTITUENTS

    SOLAR-TERRESTRIAL ACTIVITY
        RT: CLIMATIC CHANGES
        RT: LONG-TERM CHANGES
        RT: SEA LEVEL CHANGES

    SOLAR TIDES
        Notes: Before 1982 search also TIDES
        BT: TIDES
        NT: SOLAR DIURNAL TIDES
        NT: SOLAR SEMIDIURNAL TIDES
        RT: METEOROLOGICAL TIDES
        RT: SUN
        RT: TIDAL CONSTITUENTS

    SOLE MARKS
        BT: CURRENT MARKS
        RT: FLUTE CASTS

    SOLID IMPURITIES
        BT: POLLUTANTS
        NT: PLASTIC DEBRIS
        NT: TAR BALLS
        RT: FLOTSAM
        RT: PLASTICS

    SOLIDIFICATION
        BT: PHASE CHANGES
        RT: FREEZING
        RT: MELTING

    SOLITARY WAVES
        BT: SHALLOW-WATER WAVES
        RT: NONLINEAR WAVES
        RT: SOLITONS
        RT: SURFACE GRAVITY WAVES

    SOLITONS
        RT: SOLITARY WAVES

    SOLUBILITY
        BT: CHEMICAL PROPERTIES
        NT: GAS SOLUBILITY
        RT: CHEMICAL PRECIPITATION
        RT: COMPENSATION DEPTH
        RT: DISSOLUTION

    SOLUTES
        Notes: Added in 1980
        RT: SOLUBILITY
        RT: SOLUTIONS
        RT: SOLVENTS

    SOLUTIONS
        Notes: Used only as a qualifier
        NT: HYDROTHERMAL SOLUTIONS
        RT: BRINES
        RT: BUFFERS
        RT: DISSOLUTION

    SOLVATION
        NT: HYDRATION

    SOLVENT EXTRACTION
        BT: SEPARATION PROCESSES
        RT: DISSOLUTION
        RT: LEACHING

    SOLVENTS
        RT: ADDITIVES
        RT: AGENTS
        RT: ANIMAL OIL EXTRACTION

    SONAR
        BT: REMOTE SENSING EQUIPMENT
        NT: ACTIVE SONAR
        NT: PASSIVE SONAR
        RT: ACOUSTIC ARRAYS
        RT: ACOUSTIC EQUIPMENT
        RT: ACOUSTIC IMAGERY

    SONAR ARRAYS
        BT: ACOUSTIC ARRAYS
        RT: ACOUSTIC EQUIPMENT
        RT: OCEANOGRAPHIC EQUIPMENT
        RT: SONAR

    SONAR COUNTERMEASURES
        RT: UNDERSEA WARFARE

    SONAR DETECTION
        RT: ACTIVE SONAR
        RT: DETECTION
        RT: ECHO LOCATION

    SONAR IMAGERY
        BT: ACOUSTIC IMAGERY
        RT: ACTIVE SONAR
        RT: INSONIFICATION
        RT: SONAR

    SONAR RECEIVERS
        RT: ACOUSTIC EQUIPMENT
        RT: SONAR

    SONAR TARGETS
        RT: ACOUSTIC EQUIPMENT
        RT: SONAR

    SONAR TRANSDUCERS
        BT: ACOUSTIC TRANSDUCERS

    SONAR TRANSPONDERS
        BT: ACOUSTIC TRANSPONDERS

    SONIC TAGS
        BT: TAGS
        RT: ACOUSTIC EQUIPMENT
        RT: ACOUSTICS
        RT: BIOTELEMETRY

    SONOBUOYS
        BT: BUOYS
        RT: HYDROPHONES
        RT: PASSIVE SONAR
        RT: SEISMIC EQUIPMENT

    SONOGRAPHS
        RT: ACTIVE SONAR
        RT: GLORIA
        RT: INSONIFICATION

    SORPTION
        NT: ADSORPTION
        NT: DESORPTION
        RT: SURFACE PROPERTIES

    SORTING CENTRES
        Notes: Referring to national and international centres for sorting and preclassification of aquatic organisms
        BT: ORGANIZATIONS
        RT: BIOLOGICAL COLLECTIONS
        RT: DATA CENTRES
        RT: INFORMATION CENTRES

    SOUND
        RT: ACOUSTICS
        RT: ELASTIC WAVES
        RT: INSONIFICATION

    SOUND ABSORPTION
        BT: ABSORPTION (PHYSICS)
        RT: ACOUSTIC INSULATION
        RT: SOUND
        RT: SOUND ATTENUATION

    SOUND ATTENUATION
        BT: WAVE ATTENUATION
        RT: ACOUSTIC PROPERTIES
        RT: SOUND ABSORPTION
        RT: SOUND PRESSURE

    SOUND CHANNELS
        NT: SOFAR CHANNEL
        RT: ACOUSTICS
        RT: DENSITY STRATIFICATION
        RT: SOFAR

    SOUND DIFFRACTION
        BT: DIFFRACTION
        RT: SOUND
        RT: SOUND DISPERSION
        RT: SOUND PROPAGATION

    SOUND DISPERSION
        BT: DISPERSION
        RT: SOUND DIFFRACTION
        RT: SOUND PROPAGATION
        RT: SOUND REFRACTION

    SOUND GENERATION
        RT: SOUND GENERATORS
        RT: SOUND PROPAGATION

    SOUND GENERATORS
        BT: ACOUSTIC EQUIPMENT
        NT: PINGERS
        RT: SEISMIC ENERGY SOURCES
        RT: SOUND
        RT: SOUND GENERATION

    SOUND INTENSITY
        RT: ACOUSTIC PROPERTIES
        RT: SOUND MEASUREMENT

    SOUND MEASUREMENT
        BT: MEASUREMENT
        RT: SOUND INTENSITY
        RT: SOUND VELOCITY

    SOUND PRESSURE
        BT: PRESSURE
        RT: SOUND
        RT: SOUND ATTENUATION

    SOUND PRODUCTION
        Notes: Restricted to vocalization or other sources of sound production such as stridulation by animals. Before 1982 search SOUND PRODUCTION (BIOLOGICAL)
        RT: ANIMAL COMMUNICATION
        RT: AUDIO RECORDINGS
        RT: AUDITION

    SOUND PROPAGATION
        RT: DEEP WATER
        RT: DOPPLER EFFECT
        RT: INTERNAL WAVE EFFECTS

    SOUND RECORDERS
        BT: RECORDING EQUIPMENT
        RT: ACOUSTIC EQUIPMENT
        RT: ACOUSTICS
        RT: AUDIO RECORDINGS

    SOUND REFLECTION
        BT: REFLECTION
        RT: SOUND
        RT: SOUND ABSORPTION
        RT: SOUND PROPAGATION

    SOUND REFRACTION
        BT: REFRACTION
        RT: SOUND
        RT: SOUND DISPERSION
        RT: SOUND PROPAGATION

    SOUND SCATTERING
        NT: BACKSCATTER
        NT: BOTTOM SCATTERING
        NT: FORWARD SCATTERING
        RT: REVERBERATION
        RT: SOUND
        RT: SOUND ABSORPTION

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    SOUND SOURCES
        RT: SOUND
        RT: SOUND GENERATORS

    SOUND SPECTRA
        Notes: Before 1986 search also ACOUSTIC SPECTRA
        BT: SPECTRA

    SOUND TRANSMISSION
        BT: TRANSMISSION
        RT: SOUND
        RT: SOUND ATTENUATION
        RT: SOUND PROPAGATION

    SOUND VELOCITY
        BT: VELOCITY
        RT: ACOUSTIC DATA
        RT: ACOUSTIC IMPEDANCE
        RT: ACOUSTIC PROPERTIES

    SOUND WAVES
        Notes: Sound waves and underwater transmission of sound waves
        BT: ELASTIC WAVES
        RT: ACOUSTIC EQUIPMENT
        RT: ACOUSTICS
        RT: BIOLOGICAL NOISE

    SOUNDING LINES
        RT: BATHYMETRY
        RT: DEPTH MEASUREMENT
        RT: OCEANOGRAPHIC EQUIPMENT

    SOUNDINGS
        Notes: Charted depth of water
        BT: BATHYMETRIC DATA
        RT: BATHYMETRIC CHARTS
        RT: BATHYMETRY
        RT: HYDROGRAPHIC SURVEYING

    SOUTHERN OSCILLATION
        RT: AIR TEMPERATURE
        RT: ATMOSPHERIC CIRCULATION
        RT: EL NINO PHENOMENA

    SPALLING
        BT: DEFECTS
        RT: DETERIORATION

    SPAR BUOYS
        BT: BUOY HULLS
        NT: LARGE SPAR BUOYS

    SPARKERS
        BT: SEISMIC ENERGY SOURCES

    SPAT
        BT: MOLLUSCAN LARVAE
        RT: CLAM CULTURE
        RT: CULTCH
        RT: GRADING

    SPATIAL VARIATIONS
        NT: FINESTRUCTURE
        NT: LATITUDINAL VARIATIONS
        NT: MICROSTRUCTURE
        NT: REGIONAL VARIATIONS
        RT: DIMENSIONS
        RT: HORIZONTAL DISTRIBUTION
        RT: QUANTITATIVE DISTRIBUTION

    SPAWNING
        NT: WILD SPAWNING
        RT: BREEDING
        RT: NURSERY GROUNDS
        RT: REPRODUCTIVE BEHAVIOUR

    SPAWNING GROUNDS
        NT: ARTIFICIAL SPAWNING GROUNDS
        RT: ANADROMOUS SPECIES
        RT: CATADROMOUS SPECIES
        RT: FISHING GROUNDS

    SPAWNING MIGRATIONS
        BT: MIGRATIONS
        NT: ANADROMOUS MIGRATIONS
        NT: CATADROMOUS MIGRATIONS
        RT: AMPHIHALINE SPECIES
        RT: ANADROMOUS SPECIES
        RT: CATADROMOUS SPECIES

    SPAWNING POPULATIONS
        Notes: Added in 1982
        BT: ANIMAL POPULATIONS
        RT: SPAWNING
        RT: SPAWNING GROUNDS
        RT: SPAWNING MIGRATIONS

    SPAWNING SEASONS
        RT: ANADROMOUS SPECIES
        RT: CATADROMOUS SPECIES
        RT: ICHTHYOPLANKTON

    SPEAR FISHING
        Notes: Impaling fish with a spear from either above or below the water surface. Added in 1980
        BT: CATCHING METHODS
        RT: DIVING
        RT: FISHING
        RT: SPORT FISHING

    SPECIES
        Notes: Used only as a qualifier. Use of a more specific term is recommended
        BT: TAXA
        NT: AMPHIBIOTIC SPECIES
        NT: AMPHIHALINE SPECIES
        NT: ASSOCIATED SPECIES
        NT: CAVERNICOLOUS SPECIES
        NT: COMMERCIAL SPECIES
        NT: COSMOPOLITE SPECIES
        NT: DOMESTIC SPECIES
        NT: DOMINANT SPECIES
        NT: ENDEMIC SPECIES
        NT: INDICATOR SPECIES
        NT: INTRODUCED SPECIES
        NT: MIGRATORY SPECIES
        NT: PATHOGENS
        NT: RARE SPECIES
        NT: RELICT SPECIES
        NT: SEDENTARY SPECIES
        NT: SESSILE SPECIES
        NT: SIBLING SPECIES
        RT: AQUATIC ORGANISMS
        RT: BEHAVIOUR
        RT: BIOGEOGRAPHY

    SPECIES DIVERSITY
        Notes: Added in 1980
        RT: CLIMAX COMMUNITY
        RT: COMMUNITY COMPOSITION
        RT: DOMINANT SPECIES

    SPECIES EXTINCTION
        Notes: Added in 1980
        RT: NATURE CONSERVATION
        RT: OVERFISHING
        RT: RARE SPECIES

    SPECIFIC GRAVITY
        BT: PHYSICAL PROPERTIES
        RT: DENSITY
        RT: DRY WEIGHT
        RT: RELATIVE DENSITY

    SPECIFIC HEAT
        BT: THERMODYNAMIC PROPERTIES
        RT: ENTHALPY
        RT: HEAT
        RT: SPECIFIC HUMIDITY

    SPECIFIC HUMIDITY
        BT: HUMIDITY
        RT: MIXING RATIO
        RT: RELATIVE HUMIDITY
        RT: SPECIFIC HEAT

    SPECIFIC VOLUME
        RT: ISOPYCNICS
        RT: ISOSTERES
        RT: ISOSTERIC SURFACES

    SPECIFIC VOLUME ANOMALIES
        BT: ANOMALIES
        NT: THERMOSTERIC ANOMALIES
        RT: DYNAMIC HEIGHT ANOMALY
        RT: SPECIFIC VOLUME
        RT: WATER DENSITY

    SPECIFICATIONS
        Notes: Used only as a qualifier
        RT: DESIGN
        RT: EQUIPMENT
        RT: INSPECTION

    SPECIFICITY
        Notes: Used only as a qualifier
        RT: BIOCHEMISTRY
        RT: CHEMICAL REACTIONS
        RT: HOST PREFERENCES

    SPECTRA
        NT: ABSORPTION SPECTRA
        NT: CURRENT SPECTRA
        NT: DIRECTIONAL SPECTRA
        NT: ENERGY SPECTRA
        NT: FREQUENCY SPECTRA
        NT: SOUND SPECTRA
        NT: WAVE SPECTRA

    SPECTRAL ANALYSIS
        BT: MATHEMATICAL ANALYSIS
        NT: MAXIMUM ENTROPY SPECTRAL ANALYSIS
        RT: DATA REDUCTION
        RT: FREQUENCY ANALYSIS
        RT: SIGNAL PROCESSING

    SPECTRAL COMPOSITION
        BT: OPTICAL PROPERTIES
        RT: BIOLUMINESCENCE
        RT: COLOUR
        RT: LIGHT

    SPECTROCHEMICAL ANALYSIS
        RT: SPECTROPHOTOMETERS

    SPECTROPHOTOMETERS
        BT: PHOTOMETERS
        RT: LIGHT MEASUREMENT
        RT: SPECTRAL COMPOSITION
        RT: SPECTROCHEMICAL ANALYSIS

    SPECTROSCOPIC TECHNIQUES
        BT: ANALYTICAL TECHNIQUES
        NT: ABSORPTION SPECTROSCOPY
        NT: ALPHA SPECTROSCOPY
        NT: EMISSION SPECTROSCOPY
        NT: FLUORESCENCE SPECTROSCOPY
        NT: GAMMA SPECTROSCOPY
        NT: INFRARED SPECTROSCOPY
        NT: MASS SPECTROSCOPY
        NT: X-RAY SPECTROSCOPY
        RT: CHROMATOGRAPHIC TECHNIQUES
        RT: COLORIMETRIC TECHNIQUES
        RT: FLUORESCENCE

    SPEECH DISTORTION
        RT: BREATHING MIXTURES
        RT: COMMUNICATION
        RT: DIVERS

    SPEEDOMETERS
        Notes: Instruments for measuring vessel speed
        BT: MEASURING DEVICES
        RT: BOATS
        RT: FISHING OPERATIONS
        RT: NAVIGATION

    SPELAEOLOGY
        Notes: The study of caves, their flora and fauna. Added in 1980
        RT: CAVERNICOLOUS SPECIES
        RT: CAVES
        RT: GEOMORPHOLOGY

    SPERM
        Notes: Before 1986 search also SPERMATOZOA
        BT: SEXUAL CELLS
        RT: FECUNDITY
        RT: FREEZING STORAGE
        RT: MALES

    SPERMATOGENESIS
        BT: GAMETOGENESIS
        RT: SPERM
        RT: TESTES

    SPERMATOPHORES
        RT: BIOLOGICAL FERTILIZATION
        RT: SEXUAL MATURITY
        RT: SEXUAL REPRODUCTION

    SPHERES
        RT: HYDRODYNAMICS

    SPILLING WAVES
        BT: BREAKING WAVES

    SPINAL CORD
        Notes: Added in 1980
        BT: CENTRAL NERVOUS SYSTEM
        RT: VERTEBRAE

    SPINDOWN
        RT: ROTATING FLUIDS
        RT: SPINUP

    SPINUP
        RT: ROTATING FLUIDS
        RT: SPINDOWN

    SPITS
        BT: BEACH FEATURES
        NT: BARRIER SPITS
        RT: DEPOSITION FEATURES

    SPLASH ZONE
        RT: COAST DEFENCES
        RT: COASTAL STRUCTURES
        RT: CORROSION

    SPLEEN
        BT: EXCRETORY ORGANS
        RT: LYMPHOCYTES

    SPLINES
        RT: NUMERICAL ANALYSIS

    SPOIL
        RT: DREDGE SPOIL
        RT: DREDGING
        RT: WASTE DISPOSAL SITES

    SPONGE CULTURE
        BT: AQUACULTURE
        RT: CULTURES
        RT: MARINE AQUACULTURE
        RT: SEED COLLECTION

    SPONGE FISHERIES
        Notes: Added in 1983
        BT: FISHERIES
        RT: FISHING BY DIVING
        RT: MARINE FISHERIES
        RT: SPONGE CULTURE

    SPONGES
        BT: ANIMAL PRODUCTS
        RT: SPONGE CULTURE
        RT: SPONGE FISHERIES

    SPORANGIA
        RT: ASEXUAL REPRODUCTION
        RT: PLACENTA
        RT: SPORES

    SPORES
        NT: RESTING SPORES
        RT: ALGAL CULTURE
        RT: ASEXUAL REPRODUCTION
        RT: ATMOSPHERIC PARTICULATES

    SPOROGENESIS
        Notes: Added in 1980
        RT: SPORANGIA
        RT: SPORES

    SPORT FISHING
        Notes: Any activities of fishing with recreation or water sports purposes
        BT: RECREATION
        RT: ANGLING
        RT: ARTIFICIAL REEFS
        RT: BAIT

    SPORT FISHING STATISTICS
        Notes: Including number of sport fishermen and catches
        BT: FISHERY STATISTICS
        RT: GAME FISH
        RT: RECREATION
        RT: SPORT FISHING

    SPRAY
        BT: HYDROMETEORS
        RT: AEROSOLS
        RT: DROPLETS
        RT: ICING

    SPREADING CENTRES
        RT: DIVERGING PLATE BOUNDARIES
        RT: PLATE DIVERGENCE
        RT: PLATE TECTONICS

    SPRING
        Notes: Used for the season. Added in 1980
        BT: SEASONS

    SPRING STREAMS
        BT: WATER SPRINGS
        RT: FRESH WATER
        RT: GROUND WATER
        RT: INLAND WATER ENVIRONMENT

    SPRING TIDES
        BT: TIDES
        RT: AGE OF TIDE

    SQUALENE
        BT: POLYUNSATURATED HYDROCARBONS

    SQUAT LOBSTER FISHERIES
        Notes: Added in 1982
        BT: CRUSTACEAN FISHERIES
        RT: COASTAL FISHERIES
        RT: MARINE FISHERIES

    SQUID CULTURE
        Notes: Before 1982 search MOLLUSC CULTURE
        BT: MOLLUSC CULTURE
        RT: AQUACULTURE DEVELOPMENT
        RT: CEPHALOPOD FISHERIES

    STABILITY
        Notes: Use of a more specific term is recommended
        NT: SHIP STABILITY
        NT: SLOPE STABILITY
        NT: VERTICAL STABILITY
        RT: BALLAST
        RT: BUOYANCY
        RT: EQUILIBRIUM

    STABILITY CONSTANTS
        BT: CONSTANTS
        RT: STABILITY

    STABILIZED PLATFORMS
        BT: INSTRUMENT PLATFORMS
        NT: TOWERS
        RT: GYROSCOPES
        RT: INERTIAL GUIDANCE
        RT: RADAR ALTIMETRY

    STABILIZERS
        RT: SHIP MOTION
        RT: SHIP STABILITY
        RT: STABILIZING

    STABILIZING
        RT: HEAVE COMPENSATORS
        RT: STABILITY
        RT: STABILIZERS

    STACKS
        BT: COASTAL LANDFORMS
        RT: EROSION FEATURES

    STAGNANT WATER
        BT: WATER
        RT: ANOXIC CONDITIONS
        RT: DYSTROPHIC LAKES
        RT: EUTROPHICATION

    STAINING
        Notes: Staining of tissues and organisms
        RT: DISCOLOURATION
        RT: DYES
        RT: HISTOCHEMISTRY

    STAINLESS STEEL
        BT: STEEL
        RT: CORROSION CONTROL

    STANDARD DEPTHS
        Notes: Recommended depths below sea surface at which water properties should be measured
        BT: DEPTH
        RT: WATER PROPERTIES

    STANDARD OCEAN SECTIONS
        Notes: Routes along which oceanographic observations are made regularly over a period of time, e.g. Kola Section, Line P
        BT: OCEANOGRAPHIC STATIONS
        RT: FIXED STATIONS
        RT: HYDROGRAPHIC SECTIONS
        RT: OCEAN STATIONS

    STANDARD SEA WATER
        BT: SEA WATER
        RT: ARTIFICIAL SEAWATER
        RT: SALINITY MEASUREMENT
        RT: STANDARDS

    STANDARD SIGNALS
        RT: COMMUNICATION SYSTEMS
        RT: FISHING OPERATIONS
        RT: NAVIGATION

    STANDARDIZATION
        Notes: Comparison of an instrument or device with a standard to determine its value in terms of an adopted unit. Used only as a qualifier
        NT: CALIBRATION
        RT: COLLECTING DEVICES
        RT: EQUIPMENT
        RT: INTERCOMPARISON

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    STANDARDS
        RT: ACCEPTABILITY
        RT: DOCUMENTS
        RT: PRACTICAL SALINITY SCALE

    STANDING WAVES
        BT: OSCILLATORY WAVES
        RT: HYDRAULIC JUMP
        RT: RESONANCE
        RT: SEICHES

    STARCH
        Notes: Before 1982 search CARBOHYDRATES
        BT: POLYSACCHARIDES
        RT: AQUATIC PLANTS

    STARVATION
        RT: FOOD AVAILABILITY
        RT: LETHAL LIMITS
        RT: MORTALITY CAUSES

    STATIC INSTABILITY
        BT: INSTABILITY
        RT: VERTICAL STABILITY

    STATION KEEPING
        RT: CRUISE STATIONS
        RT: DEPLOYMENT
        RT: RECOVERY

    STATION LISTS
        BT: DATA REPORTS
        RT: CRUISE STATIONS
        RT: CRUISES
        RT: DATA

    STATISTICAL ANALYSIS
        Notes: Used only as a qualifier
        BT: MATHEMATICAL ANALYSIS
        NT: CORRELATION ANALYSIS
        NT: FREQUENCY ANALYSIS
        NT: REGRESSION ANALYSIS
        NT: TIME SERIES ANALYSIS
        NT: VARIANCE ANALYSIS
        RT: ANALYSIS
        RT: APPROXIMATION
        RT: BIOMETRICS

    STATISTICAL MODELS
        Notes: Used only as a qualifier
        BT: MATHEMATICAL MODELS
        RT: GAME THEORY
        RT: OPERATIONS RESEARCH
        RT: PROBABILITY THEORY

    STATISTICAL SAMPLING
        Notes: Used only as a qualifier. Before 1982 search SAMPLING (STATISTICAL)
        BT: SAMPLING
        RT: BIOLOGICAL SAMPLING
        RT: DATA COLLECTIONS
        RT: PROBABILITY THEORY

    STATISTICAL TABLES
        Notes: Used only as a qualifier
        BT: TABLES
        NT: SCATTER DIAGRAMS
        RT: CATCH STATISTICS
        RT: DATA
        RT: GRAPHIC METHODS

    STATISTICIANS
        Notes: Added in 1980
        BT: SCIENTIFIC PERSONNEL
        RT: DIRECTORIES
        RT: FISHERY STATISTICS
        RT: STATISTICAL ANALYSIS

    STATISTICS
        Notes: Used only as a qualifier
        NT: WAVE STATISTICS
        RT: BIOMETRICS
        RT: DATA PROCESSING
        RT: MATHEMATICS

    STATOCYSTS
        BT: BALANCE ORGANS

    STD OBSERVATIONS
        RT: CTD OBSERVATIONS
        RT: HYDROGRAPHIC DATA
        RT: STD PROFILES

    STD PROFILERS
        Notes: Salinity-temperature-depth profilers
        BT: PROFILERS
        RT: CONDUCTIVITY SENSORS
        RT: CTD PROFILERS
        RT: OCEANOGRAPHIC EQUIPMENT

    STD PROFILES
        BT: VERTICAL PROFILES
        RT: HYDROGRAPHIC DATA
        RT: STD OBSERVATIONS
        RT: STD PROFILERS

    STEADY STATE
        Notes: Use only as a qualifier
        RT: EQUILIBRIUM
        RT: PERTURBATIONS
        RT: STABILITY

    STEEL
        BT: FERROUS ALLOYS
        NT: STAINLESS STEEL
        RT: METALS
        RT: REINFORCED CONCRETE
        RT: STEEL STRUCTURES

    STEEL STRUCTURES
        RT: COAST DEFENCES
        RT: CONCRETE STRUCTURES
        RT: OFFSHORE STRUCTURES

    STEERING SYSTEMS
        RT: MANOEUVRABILITY
        RT: NAVIGATION
        RT: POSITIONING SYSTEMS

    STEMS
        Notes: Added in 1980
        BT: PLANT ORGANS
        RT: RHIZOMES
        RT: STOMATA

    STENOHALINITY
        Notes: Added in 1980
        BT: BIOLOGICAL PROPERTIES
        RT: ECOLOGICAL DISTRIBUTION
        RT: EURYHALINITY
        RT: SALINITY TOLERANCE

    STENOTHERMY
        Notes: Added in 1980
        BT: BIOLOGICAL PROPERTIES
        RT: ECOLOGICAL DISTRIBUTION
        RT: EURYTHERMY
        RT: TEMPERATURE TOLERANCE

    STEREOPHOTOGRAPHY
        BT: PHOTOGRAPHY
        RT: AERIAL PHOTOGRAPHY
        RT: DEPTH MEASUREMENT
        RT: PHOTOGRAMMETRY

    STERIC SEA LEVEL
        BT: SEA LEVEL
        RT: ISOSTATIC SEA LEVEL
        RT: SEA LEVEL VARIATIONS
        RT: WATER LEVELS

    STERILITY
        Notes: Natural or artificial sterility by irradiation or removal of reproductive organs
        RT: ANIMAL REPRODUCTIVE ORGANS
        RT: IRRADIATION
        RT: NUCLEAR RADIATIONS

    STERILIZATION
        NT: OZONATION
        NT: ULTRAVIOLET STERILIZATION
        RT: BACTERIA
        RT: CULTURE MEDIA
        RT: IONIZING RADIATION

    STEROIDS
        BT: LIPIDS
        NT: STEROLS
        RT: CHEMICAL COMPOUNDS
        RT: DRUGS
        RT: HORMONES

    STEROLS
        BT: STEROIDS
        NT: ACANSTEROL
        NT: CHOLESTEROL
        NT: FUCOSTEROL
        NT: SITOSTEROLS
        RT: ALCOHOLS
        RT: CHEMICAL COMPOUNDS

    STICKWATER
        BT: PROCESSED FISHERY PRODUCTS
        RT: BYPRODUCTS
        RT: CHEMICAL EXTRACTION
        RT: FISH OILS

    STIMULI
        Notes: Stimuli and their effects on aquatic organisms
        NT: AUDITORY STIMULI
        NT: CHEMICAL STIMULI
        NT: ELECTRIC STIMULI
        NT: LIGHT STIMULI
        NT: MECHANICAL STIMULI
        NT: TACTILE STIMULI
        NT: THERMAL STIMULI
        NT: VISUAL STIMULI
        RT: ADAPTATIONS
        RT: BEHAVIOUR
        RT: BEHAVIOURAL RESPONSES

    STINGING ORGANS
        RT: ELECTRIC ORGANS
        RT: LESIONS
        RT: NOXIOUS ORGANISMS

    STOCHASTIC PROCESSES
        RT: MATHEMATICAL MODELS
        RT: OPERATIONS RESEARCH
        RT: PROBABILITY THEORY

    STOCK ASSESSMENT
        RT: AERIAL SURVEYS
        RT: BIOMASS
        RT: CATCH STATISTICS

    STOCK IDENTIFICATION
        RT: ELECTROPHORESIS
        RT: MERISTIC COUNTS
        RT: POPULATION GENETICS

    STOCKING (ORGANISMS)
        RT: AQUACULTURE
        RT: AQUACULTURE TECHNIQUES
        RT: CRAYFISH CULTURE

    STOCKING DENSITY
        RT: BIOTIC FACTORS
        RT: CAGE CULTURE
        RT: DENSITY DEPENDENCE

    STOCKING PONDS
        BT: FISH PONDS
        RT: AQUACULTURE FACILITIES
        RT: FEE FISHING
        RT: STOCKING (ORGANISMS)

    STOCKS
        Notes: The exploitable group of individuals of the same species existing in a particular area at a particular time. Added in 1982
        NT: BROOD STOCKS
        NT: DEPLETED STOCKS
        NT: SHARED STOCKS
        NT: UNIT STOCKS
        RT: ANIMAL POPULATIONS
        RT: FISHERY RESOURCES
        RT: NATURAL POPULATIONS

    STOKES LAW
        RT: PARTICLE SETTLING
        RT: SETTLING RATE
        RT: VISCOSITY

    STOKES WAVES
        BT: NONLINEAR WAVES

    STOMACH
        BT: ALIMENTARY ORGANS
        NT: MASTICATORY STOMACH
        RT: DIGESTION
        RT: DIGESTIVE SYSTEM
        RT: PYLORIC CAECA

    STOMACH CONTENT
        RT: ECOLOGICAL EFFICIENCY
        RT: FEEDING BEHAVIOUR
        RT: FOOD CHAINS

    STOMATA
        Notes: Added in 1980
        RT: AQUATIC PLANTS
        RT: EVAPOTRANSPIRATION
        RT: LEAVES

    STONELEY WAVES
        BT: SURFACE SEISMIC WAVES
        RT: RAYLEIGH WAVES

    STORAGE
        Notes: Use of a more specific term is recommended; consult terms listed below. Added in 1981
        RT: CHILLING STORAGE
        RT: CODEX STANDARDS
        RT: COLD STORAGE

    STORAGE CONDITIONS
        Notes: Added in 1980
        RT: AIR TEMPERATURE
        RT: ARCHIVES
        RT: CARGOES

    STORAGE EFFECTS
        Notes: Any action of storage on the quality of processed fishery products, sediment samples and water samples, etc.
        RT: FISH INSPECTION
        RT: FISH INSPECTION REGULATIONS
        RT: FISH STORAGE

    STORAGE LIFE
        Notes: Added in 1980
        RT: CORROSION
        RT: QUALITY ASSURANCE
        RT: STORAGE

    STORAGE TANKS
        Notes: Added in 1980
        BT: TANKS
        RT: FISH STORAGE
        RT: GAS TERMINALS
        RT: STORAGE

    STORM SURGE BARRIERS
        BT: COAST DEFENCES
        RT: BARRAGES
        RT: BARRIERS
        RT: FLOODS

    STORM SURGE GENERATION
        BT: WAVE GENERATION
        RT: STORM SURGES

    STORM SURGE PREDICTION
        BT: PREDICTION
        RT: MATHEMATICAL MODELS
        RT: NEGATIVE STORM SURGES
        RT: STORM SURGES

    STORM SURGES
        BT: SURFACE WATER WAVES
        NT: HURRICANE WAVES
        NT: NEGATIVE STORM SURGES
        RT: ATMOSPHERIC PRESSURE
        RT: BEACH MORPHOLOGY
        RT: CATASTROPHIC WAVES

    STORM TIDE WARNING SERVICES
        BT: WARNING SERVICES
        RT: NEGATIVE STORM SURGES
        RT: STORM SURGE PREDICTION
        RT: STORM SURGES

    STORMS
        BT: WEATHER
        RT: FLOODS
        RT: GALE FORCE WINDS
        RT: HURRICANES

    STORMWATER RUNOFF
        BT: RUNOFF
        RT: HYDROLOGY
        RT: RAINFALL
        RT: WASTE WATER

    STRAIN
        BT: DEFORMATION
        RT: ELASTICITY
        RT: POISSON'S RATIO
        RT: SHEAR STRENGTH

    STRAIN GAUGES
        BT: INSTRUMENTS
        RT: GAUGES
        RT: MEASURING DEVICES
        RT: STRAIN

    STRAIN SEISMOMETERS
        BT: SEISMOMETERS
        RT: STRAIN GAUGES

    STRAITS
        BT: COASTAL WATERS
        RT: CHANNELS
        RT: TUNNELS
        RT: WATER EXCHANGE

    STRANDING
        Notes: Whales or other organisms washed ashore. Added in 1980
        RT: AQUATIC MAMMALS
        RT: CARCASSES
        RT: GEOGRAPHICAL DISTRIBUTION

    STRANDLINES
        BT: COASTS
        RT: GLACIAL LAKES
        RT: RAISED BEACHES
        RT: SEA LEVEL CHANGES

    STRATIFICATION
        NT: DENSITY STRATIFICATION
        NT: SALINITY STRATIFICATION
        NT: THERMAL STRATIFICATION
        RT: BAROCLINIC MODE
        RT: BAROTROPIC MODE
        RT: DESTRATIFICATION

    STRATIFIED FLOW
        BT: FLUID FLOW
        RT: BAROCLINIC MODE
        RT: BAROCLINIC MOTION
        RT: DENSITY FLOW

    STRATIFIED SHEAR FLOW
        BT: SHEAR FLOW
        RT: LEE WAVES
        RT: STRATIFIED FLOW

    STRATIGRAPHIC CORRELATION
        BT: GEOLOGICAL CORRELATION
        RT: BIOSTRATIGRAPHY
        RT: CHRONOSTRATIGRAPHY
        RT: CORRELATION

    STRATIGRAPHIC TRAPS
        RT: GEOLOGICAL EQUIPMENT
        RT: STRATIGRAPHY

    STRATIGRAPHY
        BT: GEOLOGY
        NT: BIOSTRATIGRAPHY
        NT: CHRONOSTRATIGRAPHY
        NT: MAGNETOSTRATIGRAPHY
        NT: OXYGEN ISOTOPE STRATIGRAPHY
        NT: SEISMIC STRATIGRAPHY
        RT: FOSSILS
        RT: GEOCHRONOMETRY
        RT: GEOLOGICAL TIME

    STRATOSPHERE
        BT: EARTH ATMOSPHERE
        RT: IONOSPHERE
        RT: TROPOPAUSE
        RT: TROPOSPHERE

    STREAM FLOW
        BT: WATER CURRENTS
        RT: BACKWATERS
        RT: FLOOD CONTROL
        RT: FLUID MOTION

    STREAM FLOW RATE
        BT: CURRENT VELOCITY
        RT: FLOWMETERS
        RT: RIVERS
        RT: STREAM FLOW

    STREAM FUNCTIONS
        RT: CORIOLIS PARAMETERS
        RT: DYNAMIC HEIGHT
        RT: GEOSTROPHIC EQUILIBRIUM

    STREAMERS
        BT: CABLES
        RT: HYDROPHONES
        RT: OCEANOGRAPHIC EQUIPMENT
        RT: SEISMIC EQUIPMENT

    STREAMLINES
        BT: MAP GRAPHICS
        RT: CURRENT CHARTS
        RT: CURRENT DIRECTION
        RT: CURRENT VECTORS

    STRENGTH
        Notes: Use for mechanical strength
        BT: MECHANICAL PROPERTIES
        NT: BEARING CAPACITY
        NT: COLLAPSE STRENGTH
        NT: COMPRESSIVE STRENGTH
        NT: SHEAR STRENGTH
        NT: TENSILE STRENGTH
        RT: YIELD POINT

    STRESS
        Notes: Restricted to mechanical stress. Before 1983 search also STRESS (MECHANICS)
        BT: FORCES (MECHANICS)
        NT: BOTTOM STRESS
        NT: COMPRESSION
        NT: REYNOLDS STRESSES
        NT: SHEAR STRESS
        NT: TENSION
        NT: TORQUE
        NT: WIND STRESS
        RT: BIOLOGICAL STRESS
        RT: ELASTICITY
        RT: FATIGUE (MATERIALS)

    STRESS CORROSION
        BT: CORROSION
        RT: EMBRITTLEMENT
        RT: FATIGUE (MATERIALS)
        RT: METAL FATIGUE

    STRESS-STRAIN RELATIONS
        RT: DEFORMATION
        RT: MECHANICAL PROPERTIES
        RT: SOIL MECHANICS

    STRIP MINE LAKES
        BT: LAKES
        RT: MINE TAILINGS
        RT: PITS

    STRIPPING ANALYSIS
        BT: ANALYTICAL TECHNIQUES

    ABCDEFGHIJKLMNOPQRSTUVWXYZ


    STROMATOLITES
        BT: BIOGENIC SEDIMENTARY STRUCTURES
        RT: ALGAE
        RT: ALGAL MATS

    STRONTIUM
        BT: CHEMICAL ELEMENTS
        RT: ALKALINE EARTH METALS
        RT: DISSOLVED CHEMICALS
        RT: METALS

    STRONTIUM COMPOUNDS
        RT: CHEMICAL COMPOUNDS
        RT: STRONTIUM

    STRONTIUM ISOTOPES
        BT: ISOTOPES
        RT: RUBIDIUM-STRONTIUM DATING
        RT: STRONTIUM

    STRUCTURAL ANALYSIS
        BT: STRUCTURAL ENGINEERING
        RT: DESIGN
        RT: MATHEMATICAL ANALYSIS

    STRUCTURAL BASINS
        NT: FOREARC BASINS
        NT: MARGINAL BASINS
        RT: BASINS
        RT: OCEAN BASINS
        RT: SEDIMENTARY BASINS

    STRUCTURAL DOMES
        BT: FOLDS
        NT: SALT DOMES
        RT: DIAPIRS
        RT: DOMES

    STRUCTURAL DYNAMICS
        BT: DYNAMICS
        RT: DYNAMIC LOADS
        RT: STRUCTURAL ENGINEERING

    STRUCTURAL ENGINEERING
        BT: ENGINEERING
        NT: STRUCTURAL ANALYSIS
        RT: BARRAGES
        RT: COASTAL ENGINEERING
        RT: DAMS

    STRUCTURAL GEOLOGY
        BT: GEOLOGY
        RT: GEOLOGICAL STRUCTURES
        RT: TECTONICS

    STRUCTURES
        Notes: Use only for man-made structures. Use of a more specific term is recommended
        RT: COASTAL STRUCTURES
        RT: CONCRETE STRUCTURES
        RT: CYLINDRICAL STRUCTURES

    STUPEFYING METHODS
        RT: ELECTRIC FISHING
        RT: ELECTRIFIED GEAR
        RT: EXPLOSIVE FISHING

    SUB-BOTTOM PROFILING
        Notes: Profiling using systems employing discrete sound sources, e.g. echosounders
        BT: SEISMIC EXPLORATION
        RT: ACOUSTIC EQUIPMENT
        RT: ECHOSOUNDING
        RT: PROFILING

    SUBAEREAL TOPOGRAPHY
        BT: TOPOGRAPHY (GEOLOGY)
        RT: LANDFORMS

    SUBDUCTION
        RT: ACTIVE MARGINS
        RT: FOREARC BASINS
        RT: ISLAND ARCS

    SUBDUCTION ZONES
        RT: BENIOFF ZONE
        RT: CONVERGING PLATE BOUNDARIES
        RT: PLATE CONVERGENCE

    SUBLETHAL EFFECTS
        Notes: Effects, not immediately identifiable, of harmful substances on organisms. Added in 1980
        RT: BIOACCUMULATION
        RT: BIOLOGICAL POISONS
        RT: BIOTESTING

    SUBLIMATION
        BT: VAPORIZATION
        RT: ABLATION
        RT: CONDENSATION
        RT: EVAPORATION

    SUBLIMATION HEAT
        BT: ENTHALPY
        RT: ABLATION
        RT: SUBLIMATION

    SUBLITTORAL ZONE
        BT: LITTORAL ZONE
        RT: NEARSHORE SEDIMENTATION

    SUBMARINE BANKS
        BT: SUBMARINE FEATURES
        RT: BANKS (TOPOGRAPHY)
        RT: FISHING GROUNDS
        RT: MUD BANKS

    SUBMARINE CABLE BREAKS
        RT: SUBMARINE CABLES
        RT: TURBIDITY CURRENTS

    SUBMARINE CABLES
        BT: ELECTRIC CABLES
        RT: CABLE LAYING
        RT: CABLE SHIPS
        RT: COAXIAL CABLES

    SUBMARINE CANYONS
        BT: SUBMARINE FEATURES
        RT: BOTTOM CURRENTS
        RT: CONTINENTAL SHELVES
        RT: CONTINENTAL SLOPE

    SUBMARINE CEMENTS
        Notes: Chemically precipitated mineral material
        BT: CHEMICAL SEDIMENTS
        RT: AUTHIGENIC MINERALS
        RT: CEMENTATION

    SUBMARINE FEATURES
        BT: TOPOGRAPHIC FEATURES
        NT: ABYSSAL HILLS
        NT: ABYSSAL PLAINS
        NT: ARCHIPELAGIC APRONS
        NT: CONTINENTAL BORDERLAND
        NT: CONTINENTAL MARGINS
        NT: CONTINENTAL RIDGES
        NT: CONTINENTAL RISE
        NT: CONTINENTAL SHELVES
        NT: CONTINENTAL SLOPE
        NT: DEEP-SEA CHANNELS
        NT: DEEP-SEA FANS
        NT: FRACTURE ZONES
        NT: ISLAND SLOPE
        NT: MICROCONTINENTS
        NT: OCEAN BASINS
        NT: SEABIGHTS
        NT: SEAKNOLLS
        NT: SEAMOUNT CHAINS
        NT: SEAMOUNTS
        NT: SHELF EDGE
        NT: SHOALS
        NT: SILLS
        NT: SUBMARINE BANKS
        NT: SUBMARINE CANYONS
        NT: SUBMARINE PLATEAUX
        NT: SUBMARINE RIDGES
        NT: SUBMARINE SCARPS
        NT: SUBMARINE TROUGHS
        NT: SUBMARINE VALLEYS
        NT: TRENCHES (OCEANIC)
        RT: BATHYMETRIC CHARTS
        RT: BATHYMETRY
        RT: BOTTOM TOPOGRAPHY

    SUBMARINE PLATEAUX
        BT: SUBMARINE FEATURES
        RT: MICROCONTINENTS
        RT: PLATEAUX
        RT: RELIEF FORMS

    SUBMARINE RIDGES
        BT: SUBMARINE FEATURES
        NT: ASEISMIC RIDGES
        NT: SEISMIC RIDGES
        RT: MOUNTAINS
        RT: RELIEF FORMS
        RT: RIDGES

    SUBMARINE SCARPS
        Notes: Before 1984 search also SCARPS and UNDERWATER ESCARPMENTS
        BT: SUBMARINE FEATURES
        RT: ESCARPMENTS
        RT: FAULT SCARPS
        RT: FRACTURE ZONES

    SUBMARINE SPRINGS
        Notes: Offshore emergence of fresh water
        BT: WATER SPRINGS
        RT: FRESH WATER
        RT: SEEPAGES

    SUBMARINE TANKERS
        BT: SUBMARINES
        RT: TANKER SHIPS

    SUBMARINE TROUGHS
        BT: SUBMARINE FEATURES
        RT: RELIEF FORMS

    SUBMARINE VALLEYS
        BT: SUBMARINE FEATURES
        RT: DROWNED VALLEYS
        RT: RELIEF FORMS
        RT: SUBMARINE CANYONS

    SUBMARINE VOLCANOES
        BT: VOLCANOES
        RT: MARINE GEOLOGY
        RT: OCEANIC ISLANDS
        RT: PLATE BOUNDARIES

    SUBMARINES
        Notes: Use only for manned underwater vehicles designed for military purposes
        BT: MANNED VEHICLES
        NT: SUBMARINE TANKERS
        RT: DEFENCE CRAFT
        RT: MILITARY OCEANOGRAPHY
        RT: NAVIGATION UNDER ICE

    SUBMERGED CAGES
        Notes: Added in 1980
        BT: CAGES
        RT: CRUSTACEAN CULTURE
        RT: FISH CULTURE
        RT: MARINE AQUACULTURE

    SUBMERGED SHORELINES
        BT: COASTS
        NT: RIA COASTS
        RT: DROWNED VALLEYS
        RT: EMERGENT SHORELINES
        RT: EPEIROGENY

    SUBMERGENCE
        RT: EPEIROGENY
        RT: EUSTATIC CHANGES
        RT: FJORDS

    SUBMERSIBLE PLATFORMS
        Notes: Towed or self-propelled platforms supportable on flooded hulls
        BT: MOBILE PLATFORMS
        RT: CAISSONS
        RT: JACKUP PLATFORMS
        RT: SEMISUBMERSIBLE PLATFORMS

    SUBMERSIBLES
        BT: MANNED VEHICLES
        NT: LOCKOUT SUBMERSIBLES
        NT: WET SUBMERSIBLES
        RT: DEEP-SEA DIVING
        RT: DIVING BELLS
        RT: DIVING EQUIPMENT

    SUBPOPULATIONS
        Notes: Subset of a population which comprises a self-sustained genetic unit
        RT: GENOTYPES
        RT: POPULATION GENETICS
        RT: POPULATION STRUCTURE

    SUBSEA PRODUCTION SYSTEMS
        RT: OIL AND GAS PRODUCTION
        RT: WELLHEADS

    SUBSIDENCE
        Notes: Use only in tectonic context
        BT: EPEIROGENY
        RT: TECTONICS
        RT: UPLIFT

    SUBSTRATA
        RT: ARTIFICIAL SUBSTRATA
        RT: BENTHIC ENVIRONMENT
        RT: BENTHOS

    SUBSTRATE PREFERENCES
        RT: ALGAL SETTLEMENTS
        RT: ARTIFICIAL SUBSTRATA
        RT: BIOLOGICAL SETTLEMENT

    SUBSURFACE CURRENTS
        BT: WATER CURRENTS
        NT: DEEP CURRENTS
        RT: BOTTOM CURRENTS
        RT: LAKE CURRENTS
        RT: OCEAN CURRENTS

    SUBSURFACE DEPOSITS
        BT: MINERAL DEPOSITS
        NT: FOSSIL FUELS
        NT: PHOSPHATE DEPOSITS
        RT: DEEP-SEA MINING
        RT: OIL SANDS
        RT: OIL SHALE

    SUBSURFACE DRIFTERS
        BT: DRIFTERS
        NT: SEABED DRIFTERS
        NT: SWALLOW FLOATS
        RT: CURRENT MEASUREMENT
        RT: LAGRANGIAN CURRENT MEASUREMENT

    SUBSURFACE WATER
        BT: WATER MASSES
        RT: AGE OF SEAWATER

    SUBTROPICAL CONVERGENCES
        BT: OCEANIC CONVERGENCES
        RT: GYRES
        RT: OCEANIC FRONTS

    SUBTROPICAL ZONES
        BT: CLIMATIC ZONES

    SULPHATE MINERALS
        BT: MINERALS
        NT: ANHYDRITE
        NT: BARITE
        NT: CELESTITE
        NT: EPSOMITE
        NT: GYPSUM
        NT: JAROSITE
        NT: KAINITE
        NT: POLYHALITE
        RT: SULPHATES
        RT: SULPHIDE DEPOSITS

    SULPHATE REDUCTION
        BT: REDUCTION
        RT: BIOGEOCHEMISTRY
        RT: SEDIMENT CHEMISTRY
        RT: SULPHATES

    SULPHATES
        Notes: Before 1982 search SULPHUR COMPOUNDS
        BT: SULPHUR COMPOUNDS
        RT: CALCIUM SULPHATES
        RT: MAGNESIUM SULPHATES
        RT: SULPHATE MINERALS

    SULPHIDE DEPOSITS
        BT: CHEMICAL SEDIMENTS
        RT: HYDROTHERMAL DEPOSITS
        RT: METALLIFEROUS SEDIMENTS
        RT: SEABED DEPOSITS

    SULPHIDE MINERALS
        BT: MINERALS
        NT: GREIGITE
        NT: KANSITE
        NT: MARCASITE
        NT: PYRITE
        NT: PYRRHOTITE
        RT: SULPHIDE DEPOSITS
        RT: SULPHIDES

    SULPHIDES
        Notes: Before 1982 search SULPHUR COMPOUNDS
        BT: SULPHUR COMPOUNDS
        RT: HYDROGEN SULPHIDE
        RT: IRON SULPHIDES
        RT: SULPHIDE DEPOSITS

    SULPHITES
        Notes: Before 1982 search SULPHUR COMPOUNDS
        BT: SULPHUR COMPOUNDS

    SULPHONATES
        BT: SULPHUR COMPOUNDS

    SULPHUR
        BT: CHEMICAL ELEMENTS
        RT: DISSOLVED CHEMICALS
        RT: SULPHUR COMPOUNDS
        RT: SULPHUR ISOTOPES

    SULPHUR COMPOUNDS
        NT: SULPHATES
        NT: SULPHIDES
        NT: SULPHITES
        NT: SULPHONATES
        NT: SULPHUR OXIDES
        RT: ANOXIC BASINS
        RT: CHEMICAL COMPOUNDS
        RT: SULPHUR

    SULPHUR DIOXIDE
        BT: SULPHUR OXIDES

    SULPHUR ISOTOPES
        BT: ISOTOPES
        RT: SULPHUR

    SULPHUR OXIDES
        BT: SULPHUR COMPOUNDS
        NT: SULPHUR DIOXIDE

    SULPHURIC ACID
        BT: INORGANIC ACIDS
        RT: SULPHUR COMPOUNDS

    SUMMER
        BT: SEASONS

    SUN
        RT: ASTRONOMY
        RT: PYRANOMETERS
        RT: SOLAR ACTIVITY

    SUNBURN
        Notes: Pathological condition ascribed to excessive level of ultraviolet irradiation. Added in 1980
        BT: FISH DISEASES
        RT: CULTURED ORGANISMS
        RT: ENVIRONMENTAL DISEASES
        RT: FISH CULTURE

    SUPERSATURATION
        Notes: Added in 1982
        BT: SATURATION
        RT: CHEMICAL PRECIPITATION
        RT: DISSOLUTION
        RT: SOLUBILITY

    SUPPLY BOATS
        BT: SHIPS
        RT: MARINE TRANSPORTATION
        RT: SUPPORT SHIPS

    SUPPORT SHIPS
        Notes: Applied to auxiliary ships of fishing fleets and from 1981 also to vessels serving oil rigs and other offshore installations
        BT: SHIPS
        NT: FACTORY SHIPS
        NT: MOTHER SHIPS
        RT: CRANE BARGES
        RT: DIVING BELLS
        RT: DIVING EQUIPMENT

    SUPPRESSORS
        RT: ACOUSTIC INSULATION

    SUPRALITTORAL ZONE
        BT: LITTORAL ZONE
        RT: SABKHAS

    SURF
        BT: BREAKING WAVES
        RT: BEACHES
        RT: EXPOSED HABITATS
        RT: SURF ZONE

    SURF BEATS
        BT: TRAPPED WAVES
        RT: WAVE SETDOWN
        RT: WAVE SETUP

    SURF ZONE
        BT: BEACH FEATURES
        RT: BREAKING WAVES
        RT: LONGSHORE CURRENTS
        RT: NEARSHORE DYNAMICS

    SURFACE ACTIVITY
        RT: SURFACE PROPERTIES

    SURFACE CHEMISTRY
        BT: CHEMISTRY
        RT: AIR-WATER EXCHANGES
        RT: BUBBLE BURSTING
        RT: FOAMS

    SURFACE CIRCULATION
        BT: WATER CIRCULATION
        RT: GYRES
        RT: LAKE DYNAMICS
        RT: LANGMUIR CIRCULATION

    SURFACE CLUTTER
        BT: RADAR CLUTTER

    SURFACE CRAFT
        Notes: Use of a narrower term is recommended
        BT: VEHICLES
        NT: BARGES
        NT: BOATS
        NT: CANOES
        NT: CATAMARANS
        NT: DREDGERS
        NT: DRILLING VESSELS
        NT: EMERGENCY VESSELS
        NT: FISHING VESSELS
        NT: HOVERCRAFT
        NT: HYDROFOILS
        NT: ICE BREAKERS
        NT: INFLATABLE CRAFT
        NT: LIFEBOATS
        NT: MINING VESSELS
        NT: RESEARCH VESSELS
        NT: ROW BOATS
        NT: SHIPS
        NT: SURVEY VESSELS
        RT: CAPSIZING
        RT: COLLISION AVOIDANCE
        RT: DISPLACEMENT

    SURFACE CURRENTS
        BT: WATER CURRENTS
        NT: CONTOUR CURRENTS
        RT: LAKE CURRENTS
        RT: OCEAN CURRENTS
        RT: SURFACE CIRCULATION

    SURFACE DRIFTERS
        BT: DRIFTERS
        NT: DRIFT BOTTLES
        NT: DRIFT CARDS
        NT: DROGUES
        RT: CURRENT MEASUREMENT
        RT: DRIFTING DATA BUOYS
        RT: FLOTSAM

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    SURFACE EKMAN LAYER
        BT: EKMAN LAYERS
        RT: OCEANIC BOUNDARY LAYER
        RT: WIND-DRIVEN CURRENTS

    SURFACE FILMS
        NT: MONOMOLECULAR FILMS
        RT: CAPILLARITY
        RT: LAYERS
        RT: OIL SLICKS

    SURFACE GRAVITY WAVES
        BT: WATER WAVES
        RT: CNOIDAL WAVES
        RT: NONLINEAR WAVES
        RT: SEICHES

    SURFACE LAYERS
        BT: WATER COLUMN
        NT: NEAR-SURFACE LAYER
        NT: SURFACE MICROLAYER
        RT: EPILIMNION
        RT: LANGMUIR CIRCULATION
        RT: SLICKS

    SURFACE MICROLAYER
        BT: SURFACE LAYERS
        RT: AEROSOLS
        RT: AIR BUBBLES
        RT: AIR POLLUTION

    SURFACE MIXED LAYER
        BT: MIXED LAYER
        RT: ATMOSPHERIC FORCING
        RT: EPILIMNION
        RT: MIXED LAYER DEPTH

    SURFACE NOISE
        Notes: Wind-generated noise, wave breaking, etc.
        BT: AMBIENT NOISE
        RT: SHIPPING NOISE

    SURFACE POTENTIAL
        RT: SURFACE PROPERTIES

    SURFACE PROPERTIES
        BT: PROPERTIES
        NT: ROUGHNESS
        NT: TEXTURE
        RT: ADHESION
        RT: ADSORPTION
        RT: AIR-WATER INTERFACE

    SURFACE RADIATION TEMPERATURE
        BT: SURFACE TEMPERATURE
        RT: AIR-WATER INTERFACE
        RT: INFRARED IMAGERY
        RT: RAIN

    SURFACE ROUGHNESS
        Notes: Roughness of water surface
        BT: ROUGHNESS
        RT: DRAG COEFFICIENT
        RT: RADAR ALTIMETRY
        RT: REFLECTANCE

    SURFACE SALINITY
        BT: SALINITY
        RT: SEA SURFACE

    SURFACE SEISMIC WAVES
        Notes: Use of a more specific term is recommended
        BT: SEISMIC WAVES
        NT: LOVE WAVES
        NT: RAYLEIGH WAVES
        NT: STONELEY WAVES
        RT: GROUND MOTION

    SURFACE SLOPE
        RT: DYNAMIC TOPOGRAPHY
        RT: GEOSTROPHIC FLOW
        RT: SEA LEVEL

    SURFACE TEMPERATURE
        Notes: Before 1985 search also SEA SURFACE TEMPERATURE
        BT: WATER TEMPERATURE
        NT: BUCKET TEMPERATURE
        NT: INTAKE TEMPERATURE
        NT: SURFACE RADIATION TEMPERATURE
        RT: INFRARED DETECTORS
        RT: MICROWAVE IMAGERY
        RT: SEA SURFACE

    SURFACE TENSION
        BT: TENSION
        RT: CAPILLARITY
        RT: CAPILLARY WAVES
        RT: FLOTATION

    SURFACE TOPOGRAPHY
        Notes: Before 1984 search also SEA SURFACE TOPOGRAPHY
        BT: TOPOGRAPHY
        RT: DYNAMIC TOPOGRAPHY
        RT: GEOID
        RT: GEOID ANOMALIES

    SURFACE WATER
        BT: WATER
        RT: BOTTOM WATER
        RT: EPILIMNION
        RT: EVAPORATION

    SURFACE WATER MASSES
        BT: WATER MASSES
        RT: SURFACE LAYERS
        RT: SURFACE WATER
        RT: UPPER OCEAN

    SURFACE WATER WAVES
        BT: WATER WAVES
        NT: BREAKING WAVES
        NT: CAPILLARY WAVES
        NT: CONSTRUCTIVE WAVES
        NT: LONG-CRESTED WAVES
        NT: SEICHES
        NT: SHORT-CRESTED WAVES
        NT: SIGNIFICANT WAVES
        NT: STORM SURGES
        NT: SWELL
        NT: TIDAL WAVES
        NT: TSUNAMIS
        NT: WIND WAVES
        RT: DESIGN WAVE
        RT: DIRECTIONAL SPECTRA
        RT: EXTREME WAVES

    SURFACE WAVE-INTERNAL WAVE INTERACTIONS
        BT: WAVE-WAVE INTERACTION
        RT: DEAD WATER
        RT: INTERNAL WAVE GENERATION
        RT: INTERNAL WAVES

    SURFACES
        RT: AREA
        RT: BOUNDARIES
        RT: EROSION SURFACES

    SURFACTANTS
        RT: AGENTS
        RT: DETERGENTS
        RT: DISPERSANTS

    SURFING
        BT: RECREATION
        RT: BATHING
        RT: SURF

    SURGE RESPONSE
        BT: DYNAMIC RESPONSE
        RT: BUOY MOTION EFFECTS
        RT: SURGING

    SURGES
        RT: SEICHES
        RT: TIDES
        RT: WAVE PERIOD

    SURGING
        BT: SHIP MOTION
        RT: BUOY MOTION
        RT: BUOY MOTION EFFECTS
        RT: DYNAMIC RESPONSE

    SURROUNDING NETS
        BT: FISHING NETS
        NT: LAMPARA NETS
        NT: PURSE SEINES
        RT: LIGHT FISHING
        RT: PELAGIC FISHERIES
        RT: SEINERS

    SURVEILLANCE AND ENFORCEMENT
        Notes: Surveillance of marine space and enforcement of related laws. Added in 1980
        RT: ACOUSTIC TRACKING SYSTEMS
        RT: COASTGUARDS
        RT: DEFENCE CRAFT

    SURVEY VESSELS
        BT: SURFACE CRAFT
        RT: HYDROGRAPHIC SURVEYING
        RT: HYDROGRAPHIC SURVEYS
        RT: INSTRUMENT PLATFORMS

    SURVEYING
        Notes: Use of a more specific term is recommended
        NT: HYDROGRAPHIC SURVEYING
        NT: TOPOGRAPHIC SURVEYING
        RT: BENCH MARKS
        RT: CARTOGRAPHY
        RT: COMPASSES

    SURVEYING EQUIPMENT
        BT: EQUIPMENT
        RT: ACOUSTIC EQUIPMENT
        RT: AIRBORNE EQUIPMENT
        RT: DIVING EQUIPMENT

    SURVEYING UNDERWATER
        BT: HYDROGRAPHIC SURVEYING
        RT: ARCHAEOLOGY
        RT: DIVING
        RT: DIVING SURVEYS

    SURVEYS
        Notes: Use of a more specific term is recommended
        NT: AERIAL SURVEYS
        NT: AEROMAGNETIC SURVEYS
        NT: BIOLOGICAL SURVEYS
        NT: DIVING SURVEYS
        NT: ECHO SURVEYS
        NT: ENVIRONMENTAL SURVEYS
        NT: FISHERY SURVEYS
        NT: GEOCHEMICAL SURVEYS
        NT: GEOLOGICAL SURVEYS
        NT: HYDROGRAPHIC SURVEYS
        NT: POLLUTION SURVEYS
        NT: RESOURCE SURVEYS
        NT: SITE SURVEYS
        RT: AIRCRAFT
        RT: BASELINE STUDIES
        RT: CENSUS

    SURVIVAL
        RT: BIOASSAYS
        RT: ECOPHYSIOLOGY
        RT: ESCAPEMENT

    SURVIVAL AT SEA
        RT: ACCIDENTS
        RT: HYPOTHERMIA
        RT: LIFE JACKETS

    SUSPENDED INORGANIC MATTER
        Notes: Before 1983 search also INORGANIC SUSPENDED MATTER
        BT: INORGANIC MATTER
        NT: COLLOIDAL CLAY
        RT: SUSPENDED PARTICULATE MATTER
        RT: TURBIDITY
        RT: WATER COLOUR

    SUSPENDED LOAD
        Notes: Sediment in transport
        BT: SEDIMENT LOAD
        RT: BED LOAD
        RT: RESUSPENDED SEDIMENTS
        RT: RESUSPENSION

    SUSPENDED ORGANIC MATTER
        Notes: Before 1983 search also ORGANIC SUSPENDED MATTER
        BT: ORGANIC MATTER
        RT: ANOXIC BASINS
        RT: BIOGENIC MATERIAL
        RT: CHEMICAL COMPOSITION

    SUSPENDED PARTICULATE MATTER
        Notes: Before 1984 search also SUSPENDED MATTER
        BT: PARTICULATES
        NT: RESUSPENDED SEDIMENTS
        RT: AIR-WATER EXCHANGES
        RT: BIOGEOCHEMICAL CYCLE
        RT: COLLOIDS

    SUSPENSION
        RT: FLOCCULATION
        RT: PARTICLE MOTION
        RT: RESUSPENDED SEDIMENTS

    SVERDRUP TRANSPORT
        RT: MASS TRANSPORT
        RT: OCEAN CIRCULATION
        RT: TRANSPORT

    SWALLOW FLOATS
        BT: SUBSURFACE DRIFTERS
        NT: SOFAR FLOATS
        RT: ACOUSTIC TRANSPONDERS
        RT: CURRENT MEASUREMENT
        RT: PINGERS

    SWAMP FISHERIES
        Notes: Added in 1982
        BT: INLAND FISHERIES
        RT: SEASONAL VARIATIONS
        RT: SWAMPS

    SWAMPS
        BT: WETLANDS
        NT: MANGROVE SWAMPS
        RT: AQUATIC ENVIRONMENT
        RT: DELTAS
        RT: LAKES

    SWATHS
        RT: SEAFLOOR MAPPING

    SWAYING
        BT: SHIP MOTION
        RT: BUOY MOTION

    SWELL
        BT: SURFACE WATER WAVES
        NT: ROLLERS
        RT: BEACH CUSPS
        RT: SURFACE GRAVITY WAVES
        RT: WIND WAVES

    SWIM BLADDER
        Notes: Considered as hydrostatic organ
        BT: BLADDERS
        RT: BUOYANCY
        RT: FISH SIZING
        RT: FLOTATION

    SWIMMING
        Notes: Restricted to aquatic organisms. Before 1982 search LOCOMOTION
        BT: LOCOMOTION
        RT: FINS
        RT: FISH PHYSIOLOGY
        RT: SWIM BLADDER

    SYMBIONTS
        RT: COMMENSALS
        RT: EPIPHYTES
        RT: SYMBIOSIS

    SYMBIOSIS
        BT: INTERSPECIFIC RELATIONSHIPS
        RT: CLEANING BEHAVIOUR
        RT: COMMENSALISM
        RT: EPIBIOSIS

    SYMPATRIC POPULATIONS
        Notes: Populations of two or more closely related species living in the same geographical area or having overlapped geographical areas
        RT: ALLOPATRIC POPULATIONS
        RT: GEOGRAPHICAL DISTRIBUTION
        RT: POPULATION GENETICS

    SYMPTOMS
        Notes: Added in 1980
        NT: EXOPHTHALMIA
        NT: HAEMORRHAGE
        NT: NECROSES
        RT: DIETARY DEFICIENCIES
        RT: DISEASE DETECTION
        RT: DISEASES

    SYNAPSES
        Notes: Area of functional contact between two nerve cells. Added in 1980
        RT: NERVOUS SYSTEM
        RT: NEURONS
        RT: NEUROTRANSMITTERS

    SYNCLINES
        BT: FOLDS
        RT: ANTICLINES
        RT: GEOSYNCLINES

    SYNCLINORIA
        BT: FOLDS
        RT: ANTICLINORIA

    SYNECOLOGY
        BT: ECOLOGY
        RT: ADAPTATIONS
        RT: AQUATIC COMMUNITIES
        RT: BEHAVIOUR

    SYNERGISM
        RT: BEHAVIOUR
        RT: PHYSIOLOGY

    SYNONYMY
        Notes: Added in 1980
        RT: TAXONOMY
        RT: TERMINOLOGY

    SYNOPSIS
        Notes: Comprehensive study on taxonomy and biology of a species
        BT: DOCUMENTS
        RT: LIFE CYCLE
        RT: LIFE HISTORY
        RT: TAXONOMY

    SYNTHETIC APERTURE RADAR
        BT: MICROWAVE RADAR
        RT: SCATTEROMETERS

    SYNTHETIC FIBRES
        Notes: Any types of synthetic fibres used for construction of nets, ropes, etc.
        RT: GEAR MATERIALS
        RT: NETTING MATERIALS
        RT: PLASTICS

    SYSTEM ANALYSIS
        Notes: Including flow charting. Used only as a qualifier
        RT: COMPUTER PROGRAMS
        RT: MATHEMATICAL MODELS
        RT: METHODOLOGY

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