NOAA/NMFS/NWFSC/TM15: Status Review for Oregon's Umpqua River Sea-Run Cutthroat Trout

U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications

Tech Memo-15: Status Review for Oregon's Umpqua River Sea-Run Cutthroat Trout

Acknowledgments
Introduction: Terminology
Key Questions in ESA Evaluations: The "Species" Question; Hatchery Fish and Natural Fish; Thresholds for Threatened or Endangered Status
Summary of Arguments Presented by the Petitioners Reproductive Isolation Philopatry State Agency Designation Geographic Isolation Genetic Isolation Ecological and Genetic Diversity Population Trends North Umpqua River South Umpqua River
Summary of Environmental Information in the Umpqua River Basin General Description of Basin Climate and Precipitation Hydrology and River Flows River Water Temperature Water Temperature Data from Steamboat Creek Water Temperature Data from Winchester Dam Barriers to Fish Passage Summary of Environmental Factors
Summary of Biological Information on Coastal Cutthroat Trout Life-History Forms of Coastal Cutthroat Trout Sea-Run or Anadromous O. c. clarki Non-Migratory or Resident O. c. clarki Resident Fish in the Umpqua River Basin River-Migrating or Potamodromous O. c. clarki Potamodromous Fish in the Umpqua River Basin Life History of Coastal Cutthroat Trout Early Life History Parr Movements Smoltification Timing of Smolt Migrations in the Umpqua River Estuary And Ocean Migration Ocean Migrations by Umpqua River Cutthroat Trout Adult Freshwater Migrations Run-Timing in the Umpqua River Basin Straying Spawning Spawning Sites in the Umpqua River Basin Interactions of Cutthroat Trout with Other Salmonids Temperature tolerance in Cutthroat Trout Genetics Future Genetic Studies Genetic Relationship of Life-History Forms Genetic Studies on Life-History Forms in Other Species Sex Ratios of Different Salmonid Life-History Forms Hatchery Releases in Umpqua River Basin Hatchery Releases in the North Umpqua River Return-Timing of Hatchery and Natural Adults Hatchery Releases in the Lower Umpqua River Hybridization Between Cutthroat and Rainbow Trout Releases of Hatchery Rainbow Trout in the Umpqua River
Population Trends: Sea-Run Cutthroat Trout; Resident and Potamodromous Cutthroat Trout
Discussion Reproductive Isolation Relationship Between Different Life-History Forms Reproductive Isolation of Umpqua River O. clarki Ecological and Genetic Diversity Physical and Environmental Features Distance of Freshwater Migration Run Times and Water Temperatures Effects of Artificial Propagation The Threshold Question
Conclusions: Prospects for Additional Information
Citations
Glossary

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