Genetic stock composition analysis of Chinook salmon (Oncorhynchus tshawytscha) bycatch samples from the 2019 Gulf of Alaska trawl fisheries

Guthrie III, C. M.; Nguyen, Hv. T.; Karpan, K.; Larson, W. A.

doi:10.25923/zj3t-g970

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Genetic stock composition analysis of Chinook salmon (Oncorhynchus tshawytscha) bycatch samples from the 2019 Gulf of Alaska trawl fisheries

2021
By Guthrie III, C. M. ; Nguyen, Hv. T. ; Karpan, K. ; ...
Series: NOAA technical memorandum NMFS-AFSC ; 417

[PDF-2.12 MB]

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Personal Author:

Guthrie III, C. M. ; Nguyen, Hv. T. ; Karpan, K. ; Larson, W. A.

Guthrie III, C. M. ; Nguyen, Hv. T. ; Karpan, K. ; Larson, W. A. Less -
Corporate Authors:

United States. National Marine Fisheries Service. ; Alaska Fisheries Science Center (U.S.). ; Auke Bay Laboratories (Juneau, Alaska)

United States. National Marine Fisheries Service. ; Alaska Fisheries Science Center (U.S.). ; Auke Bay Laboratories (Juneau, Alaska) Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) Less -
Description:

A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) Prohibited Species Catch (bycatch) of the 2019 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 2019, 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 sixth year for this sampling protocol with 14% of the estimated Chinook salmon bycatch from the pollock fishery successfully genotyped. Based on analysis of 2,883 Chinook salmon samples from a total bycatch of 20,983 fish, British Columbia (39%), West Coast US (33%), Northwest GOA (16%) and Coastal Southeast Alaska (10%) stock groups comprised the largest regional contributions. In 2019, 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 686 Chinook salmon bycatch samples analyzed from this fishery in NMFS Statistical Area 630 and 620, the West Coast US region had the largest contribution (69%), with smaller contributions from British Columbia (22%) and other stocks. The stock composition estimates for Chinook salmon bycatch samples collected from federally managed trawl fisheries in the GOA continue to show that the vast majority of Chinook salmon that are encountered originate from regions South and East of the Alaska Peninsula. This pattern also holds for samples analyzed across finer-scale area and time strata within the GOA.
Keywords:

[+]

Bycatches Chinook Salmon Genomics Trawls And Trawling
Series:

NOAA technical memorandum NMFS-AFSC ; 417
DOI:

https://doi.org/10.25923/zj3t-g970
Document Type:

Technical Memorandum
Place as Subject:

Alaska, Gulf of (Alaska)
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:7eaa4ed6bb970ac689b709266f310d3e3e7a066aa79d9a84bf2fefa5fcf12711
Download URL:

https://repository.library.noaa.gov/view/noaa/29529/noaa_29529_DS1.pdf
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Genetic stock composition analysis of Chinook salmon (Oncorhynchus tshawytscha) bycatch samples from the 2019 Gulf of Alaska trawl fisheries

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