Abundance of Skeena River Chum Salmon during the Early Rise of Commercial Fishing

Autor: Jack A. Stanford, Michael H. H. Price, Nick J. Gayeski
Rok vydání: 2013
Předmět:
Zdroj: Transactions of the American Fisheries Society. 142:989-1004
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2013.790842
Popis: We used reported commercial catch data and historical information to estimate the abundance of Skeena River Chum Salmon Oncorhynchus keta during the early rise (1916–1919) in the commercial fishery to provide historical perspective for recovery plans. We applied a Bayesian analysis to address the uncertainties associated with the estimation process. Based on the historical catch of 204,000 in 1919 and an estimated harvest rate of 0.32–0.58, the estimated return of Skeena Chum Salmon ranged from 355,000 to 619,000, with the most probable single estimate being 431,000. The estimated return of Chum Salmon based on the 1916–1919 geometric mean catch of 154,000 ranged from 268,000 to 471,000, with the most probable single estimate being 325,000. Our posterior modal historical estimates are 8–11 times larger than the estimates for the contemporary period 1982–2010 and 39–52 times larger than those for the most recent period of 2007–2010. Intense harvest pressure is the single most probable factor expla...
Databáze: OpenAIRE
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