Estimation of the Stock Composition of Chum Salmon....
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GRANT NUMBER: NA76FD0405          NMFS NUMBER: 96-NWR-021

REPORT TITLE:  Estimation of the Stock Composition of Chum Salmon Fisheries in Puget Sound, Washington: An Improved Technical Basis for Fisheries Management--Year 3

AUTHOR:  Northwest Indian Fisheries Commission and Northwest Washington Indian Tribes

PUBLISH DATE:  April 2000

AVAILABLE FROM: National Marine Fisheries Service, Northwest Regional Office, 7600 Sand Point Way, NE, Seattle, WA 98115.  PHONE: (206) 526-6115


Chum salmon fisheries in Skagit Bay, Possession Sound, Central Puget Sound, and Hood Canal were sampled weekly in 1997 and 1998. Stock composition of the samples was estimated by using genetic stock identification (GSI) analysis. Sampling crews extracted heart, liver, and muscle tissue from individual fish landed in the fisheries. Maximum likelihood estimation computed estimates of baseline chum stocks composed in the samples. Fishery samples received a two-step analysis. Lower-than-normal returns in 1997 resulted in some sampling goals not being achieved. Additional sampling taken in 1998 met with better results. Weekly mean estimates were graphically constructed from the time series of data stretching back to 1991 for the Hood Canal and Central Puget Sound catch areas and back to 1994 for the Possession Sound and Skagit Bay catch areas. Correlation coefficients were calculated from weekly stock composition estimates to compare similarities among stock groups. Negative correlation coefficients were computed between at least two stock groups in each fishery area. Overall, the GSI analysis showed that non-local stocks contributed to the terminal area harvest, at times significantly.

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