Predation on Sockeye Salmon Fry by Juvenile Coho Salmon in the Chignik Lakes, Alaska: Implications for Salmon Management
- 1 February 1992
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 12 (1) , 87-102
- https://doi.org/10.1577/1548-8675(1992)012<0087:possfb>2.3.co;2
Abstract
-The consumption of recently emerged sockeye salmon Oncorhynchus nerka by juvenile coho salmon O. kisutch in Chignik Lake, Alaska, was estimated for 15 May–5 August, 1985–1987. Estimated daily consumption of sockeye salmon fry by individual coho salmon in Chignik Lake, based on a stomach evacuation method, increased from about 2.0 fry in late May to 3.3 fry in June, then it declined in July and early August to 1.1 fry. Average consumption during each year, based on a bioenergetic approach, was within 14% (range, 15–20%) of the stomach evacuation method estimates, whereas bioenergetic estimates on a given day generally were within 30% of the stomach evacuation method estimates. Few coho salmon were captured in nearby Black Lake, where consumption of sockeye salmon fry per juvenile coho salmon was low. Estimates of sockeye salmon fry consumed by coho salmon in Chignik Lake, based on two independent estimates of juvenile coho salmon abundance, were 68 million, 24 million, and 78 million, which repre...Keywords
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