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Stock Assessment of Sockeye Salmon in the Buskin River, 2014-2017

Mark J. WitteveenDavid G. Evans (Biometrician)Kyle Shedd

出版	Alaska Department of Fish and Game, Division of Sport Fish, Research and Technical Services, 2018
URL	http://books.google.com.hk/books?id=34nivQEACAAJ&hl=&source=gbs_api

註釋The Alaska Department of Fish and Game, Division of Sport Fish, has assessed the annual run of Buskin River sockeye salmon (Oncorhynchus nerka) on Kodiak Island, Alaska since 1990. Buskin River sockeye salmon weir counts were 13,976; 8,718; 11,297; and 7,219 fish for 2014-2017, respectively. Weir counts for Lake Louise were 925, 280, 156, and 141 sockeye salmon for 2014-2017, respectively. Reported annual subsistence harvests for the Buskin River Section were 5,616; 3,920; and 4,767 sockeye salmon for 2014-2016, respectively; harvest is not available for 2017 at this time. Mixed stock analysis of genetic samples from the Buskin River sockeye salmon subsistence fishery showed 91-97% of the 2014-2017 harvests were of Buskin Lake origin sockeye salmon and 0.5-4.1% were of sockeye salmon bound for Lake Louise. In interviews conducted from 2014 through 2017, an average of 89% of subsistence users reported each year that the Buskin River was a traditional fishing location, and an average of 79% reported each year that they subsistence fished in other areas. Enumerated sockeye salmon spawning escapement for the entire drainage was 14,901; 8,998; 11,453; and 7,360 fish for 2014-2017, respectively. Based on a Bayesian spawner-recruitment analysis, estimated spawning escapement for maximum sustained yield is about 6,500 fish (95% credibility interval 5,100-8,400). A sustained yield probability analysis supports the current Buskin Lake system biological escapement goal (BEG) range of 5,000-8,000 sockeye salmon. Age-1.3, -2.2, and -2.3 sockeye salmon composed 90-99% of the subsistence harvests for 2014-2017 and composed 76-96% of the Buskin River and 50-100% of the Lake Louise escapements. Male to female ratios for the Buskin River were between 0.7 and 1.1 to 1 for 2014-2017; they were 1.3-2.5 to 1 for Lake Louise, and 0.8-1.5 to 1 for the subsistence harvest.