Juvenile Chum Salmon Migration & Distribution in the Gulf of Alaska
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Processing juvenile salmon catch on OCC survey. |
Juvenile chum salmon are an integral component of the North Pacific Ocean ecosystem and have figured prominently in investigations targeted at understanding ecosystem function. Juvenile chum salmon were collected during trawl surveys conducted by the Auke Bay Laboratory's Ocean Carrying Capacity Program (OCC), in conjunction with GLOBEC (Global Ocean Ecosystems Dynamics), over a multi-year period. Genetic data obtained from these fish are being used to identify the contribution of regional groups of chum salmon populations from Washington to south-central Alaska around the Gulf of Alaska (GOA) in summer-fall 2000-2004. Stock-group abundance models of wild and hatchery chum salmon will be developed to determine the impact of large numbers of hatchery produced chum salmon on the survival of wild stocks in the GOA.
Previous migration models of juvenile chum salmon in the GOA indicate a counter-clockwise movement pattern where the juveniles leaving nearshore waters of North America migrate along the continental shelf, typically north and then west, before entering offshore waters in fall and winter. Little is known about many aspects of this migration such as migration rates, abundance and distribution of specific population groupings along this corridor, and point of debarkation where the juveniles move from coastal to offshore waters.
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Genetic stock identification of juvenile chum salmon captured during the 2001 OCC/GLOBEC summer survey aboard the F/V Great Pacific. |
Co-investigators and cooperating agencies:
OCC Program
Funding:
National Oceanic and Atmospheric Administration
GLOBEC
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