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Genetic stock composition analysis of Chinook salmon bycatch samples from the 2018 Gulf of Alaska trawl fisheries
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2020
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Description:A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) Prohibited Species Catch (bycatch) of the 2018 Gulf of Alaska (GOA) trawl fisheries for walleye pollock (Gadus chalcogrammus) and rockfish (Sebastes spp.) was undertaken to determine stock composition. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game’s SNP baseline. In 2018, genetic samples were collected from Chinook salmon taken in the bycatch of the GOA pollock trawl fisheries using a simple random sample protocol with trip being the primary unit. This was the fifth year for this sampling protocol with 15% of the estimated salmon bycatch from the pollock fishery successfully genotyped. Based on analysis of 2,226 Chinook salmon samples from a total bycatch of 14,820 fish, British Columbia (43%; 6,433), West Coast US (33%; 4,846), and Coastal Southeast Alaska (18%; 2,728) stock groups comprised the largest regional contributions. In 2018, genetic samples from the bycatch of the GOA rockfish catcher vessel fishery were collected by the fishing industry using a census sampling protocol. Based on the genotyping of 504 Chinook salmon bycatch samples collected from this fishery in NMFS Statistical Area 630, West Coast US region had the largest contribution (53%: 264) with smaller contributions from British Columbia (28%; 141), and Coastal Southeast Alaska (11%; 54) regions. The 2018 GOA stock composition estimates for Chinook salmon bycatch in both the trawl and rockfish fisheries follow a similar trend observed in recent years with most (>90%) Chinook salmon encountered originating from three large southern regions between coastal Southeast Alaska and northern California. This pattern also holds for samples collected across finer-scale time and area strata within the GOA.
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Rights Information:Public Domain
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Compliance:Submitted
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