Pelagic Plan Team Report Processing
Certain charts in the Pelagic Plan Team Report contain data other than the monthly and annual values of Total Landings, Commercial Landings and Value for the individual species or species groups. Below is a description of how these values are calculated.
Pelagic Plan Team Fishing Methods
The Troll category includes the pelagic landings of combined troll/bottomfishing trips as well as the landings of purely troll trips. The Other category includes pelagic species not caught by longlining or trolling such as barracuda, rainbow runner and dogtooth tuna, caught by bottomfishing or spearfishing methods.
Pelagic Plan Team Species Groups
The major species groups of Tunas, Other PPMUS and Miscellaneous are as defined in the Pelagic Plan Team Report tables. Rays and Sunfish are included in the Other Pelagic Fish species.
Number of Boats Landing Any Pelagic Species, Tunas and Other PPMUS
Before 1997, each boat counted in each of the three categories made at least one landing in an Offshore Creel Survey interview of at least one species in the appropriate species group in the given year. In 1997 and after the count of non-interviewed boats that made at least one landing of a species in the appropriate species group in a longline log was added to the count of interviewed boats from the Offshore Creel Survey.
Number of Boats Lnding Any Pelagic Species using All Methods, Trolling and Longlining
Before 1997, each boat counted in the Any Method column made at least one landing in an Offshore Creel Survey interview of at least one pelagic species in the given year. Each boat counted in the Longlining column made at least one landing in an Offshore Creel Survey interview of at least one pelagic species, using the longline method in the given year. Each boat counted in the Trolling column made at least one landing in an Offshore Creel Survey interview of at least one pelagic species, using trolling or combined troll/bottom fishing methods in the given year. In 1997 and after the count of non-interviewed boats that made at least one landing of a pelagic species in a longline log during the given year was added to the count of interviewed boats from the Offshore Creel Survey in the Any Method and Longlining columns
Number of Trolling Trips and Longline Sets Landing Any Pelagic Species
The number of Trolling Trips is calculated by first subtracting the total pelagic landings by longlining from the total pelagic landings by all methods to get an estimate of the number of pounds caught by trolling and other fishing methods. This value is divided by the catch per hour for pure troll trips, from the Offshore Creel Survey system CPUE data, to get the number of trolling hours. The number of trolling hours is then divided by the hours per trip for a purely trolling trip from the Offshore Creel Survey system CPUE data to get the number of troll trips.
The number of Logbook Longline Sets is obtained by counting all of the sets entered in the longline logbook system for the given year for interviewed and non-interviewed boats.
Before 1997, the number of Creel Survey Longline Sets is the expanded number of longline fishing trips from the Offshore Creel Survey system. In 1997 and after the count of all of the sets entered in the longline logbook system for non-interviewed vessels is added to the number from the Offshore Creel Survey System.
Set-Hours for All Pelagic Species By Longlining
The number of set-hours using logbook data are obtained by summing the duration all of the sets entered in the longline logbook system for the given year for interviewed and non-interviewed boats. The duration of a set is defined as from end of set time to the beginning of haul time.
Before 1997, the number of Set-hours using creel survey data are the expanded number of longline fishing trip-hours from the Offshore Creel Survey system. In 1997 and after this number is the expanded number of longline fishing trip-hours from the Offshore Creel Survey system for interviewed vessels plus the sum of the duration of the sets entered in the longline logbook system for non-interviewed vessels.
Number of Longline Hooks Set
The number of longline hooks set from logbook data are obtained by summing the number of hooks for sets entered in the longline logbook system for the given year for interviewed and non-interviewed boats and dividing by 1000.
Before 1997, the number of longline hooks set from creel survey data are the expanded number of longline hooks from the offshore creel survey system CPUE data. In 1997 and after this number is the expanded number of longline fishing hooks from the offshore creel survey system for interviewed vessels plus the sum of the number of hooks for the sets entered in the longline logbook system for non-interviewed vessels.
Trolling Catch Rates for All Pelagic Species and Number of Troll Hours
The pounds/trip-hour is calculated from purely trolling interviews in the Offshore Creel Survey Data where the number of hours was recorded. The total catch from these interviews is divided by the total number of trolling hours to obtain pounds/trip-hour
The number of Trip-Hours is calculated by first subtracting the total longline pelagic landings from the total pelagic landings to get an estimate of the number of pounds caught by trolling and other fishing methods. This value is divided by the catch per hour for pure troll trips, from the Offshore Creel Survey system CPUE data, to get the number of trolling trip-hours
Trolling Catch Rates for Specific Species
The values for each species is obtained by dividing the Troll Total Landings for each species by the expanded number of trip-hours for purely trolling trips from the Offshore Creel Survey System CPUE data.
Tables Alia Longline Catch Rates from Logbook and Creel Survey Data and Pounds/Fish Data
These values compare the Catch Rates of only the alias. For the Logbook Catch Rate the total number of kept fish of each species from the logbook data are divided by the sum of the hooks in the sets of alias or surveyed vessels over the given year used to catch them.
For the Creel Survey Catch Rate the expanded total longline landings for each species from the Offshore Creel Survey data are divided by the pounds/fish value obtained by averaging Offshore Creel Survey data over the year to find the number of pieces of each species. The number of pieces for each species caught during the year is divided by the expanded number of hooks for the given year from the Offshore Creel Survey Data.
The Creel Survey Lbs/Fish for each species was calculated from the creel survey interviews by dividing the total pounds of each species sampled during the year by the number of fish of sampled during the year. If the fish were sampled as other than whole (ie Gilled and Gutted) the sampled weight is divided by the appropriate factor (less than 1) to get the whole weight. All weights were measured directly before 2000, but after that most weights were calculated from length measurements. Since these fish are caught by alias operating close to Tutuila this represents fish sizes close to shore.
The Cannery Sampled Lbs/Fish for each species was the South Pacific Regional Longline Port Sampling Form. The length measurements on these forms are made at the canneries when the fish are unloaded there. The weight of each sampled fish is calculated from the length measurements. These weights are summed over the year for each species and are then divided by the number of fish of that species sampled during the year. Since these fish are caught by larger boats operating away from Tutuila this represents fish sizes further out to sea from Tutuila.
Inflation Adjusted Revenue per Trolling Trip for All Species, Tunas and Other PPMUS
The trolling and troll/bottom interviews in the Offshore Creel Survey system landing any Pelagic Species are first counted for the given year to get the number of trips. The unadjusted revenue/trip for Tunas and Other PPMUS is calculated by first summing the value of the species in these species groups caught by trolling or troll/bottomfishing methods and then dividing this by the number of trips. The unadjusted revenue/trip for All Species is the sum of the value of all species, pelagic or not, caught by the trolling and troll/bottom trips divided by the number of such trips
The unadjusted revenue/trip values for the pelagic species subgroups above and for all species were adjusted for inflation by multiplying the given year's revenue/trip by the 2002 consumer price index (CPI) divided by the CPI for that year.
Inflation Adjusted Revenue per Alia Longline Trip for All Species, Tunas and Other PPMUS
The longlining interviews in the Offshore creel survey system landing any of the pelagic species are first counted for the given year to get the number of trips. The unadjusted revenue/trip for Tunas and Other PPMUS is calculated by first summing the value of the species in these species groups caught by longlining and then dividing this by the number of trips. The unadjusted revenue/trip for All Species is the sum of the value of all species, pelagic or not, caught by the longlining trips divided by the number of such trips
The unadjusted revenue/trip values for the pelagic species subgroups above and for all species were adjusted for inflation by multiplying the given year's revenue/trip by the 2002 consumer price index (CPI) divided by the CPI for that year.