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Stock Identification of Alaska Chinook....
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Genetic Stock Identification of Alaska Chinook Salmon
Department of Fish and Game
National Marine Fisheries Service, Alaska Region, P.O.
Box 21668, Juneau, AK 99802-1668. TELEPHONE:
of the origins of chinook salmon captured as bycatch in
fisheries targeting groundfish in the Gulf of Alaska and
Bering Sea/Aleutian Islands is a management and conservation
concern. Mixed-stock analysis using genetic data
has been successfully used to identify stock components
of chinook salmon mixtures in Washington and British Columbia
and may be an ideal tool for identifying stock of origin
of bycaught chinook salmon in Alaskan waters. Although
populations of chinook salmon from California to British
Columbia have been genetically characterized, data describing
Alaskan populations are limited. In this study the
investigators collected genetic data from wild-spawning
and hatchery populations of chinook salmon from throughout
Alaska to better identify populations that may be contributing
to bycatch in the Gulf of Alaska and the Bering Sea.
The investigators also developed a multiplex screen to
assay genetic variation at microsatellite loci, a class
of DNA markers. With the allozyme data, the investigators
performed simulation studies using maximum likelihood
methods to test identifiability of regional stock groupings
of chinook salmon in mixtures. Data were included
from throughout the North American range of chinook salmon.
Eight regions were studied: (1) Western Alaska;
(2) Southeast Alaska; (3) British Columbia, non-Fraser
River; (4) British Columbia, Fraser River; (5) Puget Sound;
(6) Washington Coastal; and (8) California-Oregon.
The results of the simulations indicate that major regional
groups of chinook salmon can be identified in mixtures
with a high degree of accuracy and precision.
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