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Genetic Stock Composition of the Commercial Harvest of Chinook Salmon in Copper River District, 2018-2021

Andrew W. BarclaySara Ellen GilkKyle SheddChristopher HabichtJeremy Botz

出版	Alaska Department of Fish and Game, Division of Sport Fish, Research and Technical Services, 2022
URL	http://books.google.com.hk/books?id=YcDUzwEACAAJ&hl=&source=gbs_api

註釋Chinook salmon are harvested in subsistence, commercial, sport, and personal use fisheries throughout the Copper River drainage and in nearshore marine waters. This project was designed to estimate the stock-specific harvest of Chinook salmon in the Copper River District commercial drift gillnet fishery using genetics samples from 2018 through 2021. This project applied the available baseline of genetic information representing Chinook salmon populations from within the Copper River drainage, around the Gulf of Alaska, and from southern populations to estimate the relative stock compositions of Chinook salmon harvests in the Copper River District commercial fishery. The results show that most of the fish in the Copper River commercial fishery originated from Copper River populations, which is consistent with findings from previous studies. The consistent temporal pattern in the composition of the commercial fishery harvests observed in previous studies was also observed across the 4 years of this study. As the season progressed, the proportion of Upper Copper River Chinook salmon decreased, and the proportion of Lower Copper River Chinook salmon increased. The results support a historical commercial management approach of providing inriver passage for all temporal components of the run. Genetic data allow for estimating the stock-specific harvests of wild stocks or stocks (with and without coded wire tags) from other areas.