Species selective predation on juvenile pink oncorhynchus gorbuscha and chum salmon oncorhynchus keta by coho salmon oncorhynchus kisutch

Hargreaves, N.B.; Lebrasseur, R.J.

Canadian Journal of Fisheries and Aquatic Sciences 42(4): 659-668

1985


ISSN/ISBN: 0706-652X
Accession: 006455017

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Abstract
Predation on juvenile pink salmon (O. gorbuscha) and chum salmon (O. keta) by yearling coho (O. kisutch) was studied in marine enclosures in Masset Inlet, British Columbia (B.C.). These experiments demonstrated that coho prey selectively upon pink salmon even when chums are both significantly smaller and more abundant than pink salmon. Reexamination of the results of similar experiments conducted in Burke Channel, B.C., also confirms that mortality was biased towards pink salmon. Prey species may be more important than prey size for coho that prey upon mixed populations of pink and chum salmon during early sea life.