Populations of unenhanced coho salmon (Oncorhynchus kisutch) in the North and South Thompson River watersheds have declined at rates >50% per generation since 1988. In recent years, <5 female spawners/km were seen on average in these streams. Of a sample of 34 extant populations in 1988, no coho were observed in 11 of these in 1997. Populations were judged to be at a high risk of biological extinction. To conserve these populations, managers were advised that fishing mortality should be as close to zero as possible. In 1998, major changes were made to salmon fisheries in British Columbia. No directed fisheries on wild stocks of coho were permitted, and there was mandatory non-retention of coho. In areas where Thompson coho were expected to be prevalent, only a few experimental salmon fisheries were allowed. In areas where Thompson coho were not expected to be prevalent, the only salmon fisheries permitted were directed at the other species...
Irvine, James R., Bradford, Michael. 1999. Declines in the Abundance of Thompson River Coho Salmon in the Interior of Southern British Columbia, and Canada's Coho Recovery Plan (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks. Conference Biology & ManagementProceedings. Vol. 2
Topic: Species and Ecosystems at Risk
Keywords: coho salmon, conservation, extinction, Fraser River, Oncorhynchus kisutch, risk, Thompson River
Scientific Name: Oncorhynchus kisutch
English Name: Coho Salmon
Other Identifier: University College of the Cariboo
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