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Diet composition of northern pikeminnow in the Lower Granite Reservoir system

By G.P. Naughton and D.H. Bennett

Abstract

Predation in Columbia River, Washington, USA basin reservoirs by northern pikeminnow can be a major source of mortality of juvenile anadromous salmonids near dams. The purpose of this project was to estimate the diet composition of northern pikeminnow in the tailrace and forebay of Lower Granite Dam, Snake River, Idaho, USA and compare with those from the more lotic habitat in upper Lower Granite Reservoir. Crustaceans and nonsalmonid fishes were the most abundant food items by weight in stomach samples collected from northern pikeminnow between April 1996 and August 1997. Juvenile salmonids were not a major component of northern pikeminnow diets at any sampling locations as we found juvenile salmonid remains in 0.5% of 396 northern pikeminnow stomachs examined. Our results suggest that salmonid predation may be reduced relative to earlier years when lower flows occurred.Naughton and Bennett "Diet composition of northern pikeminnow in the Lower Granite Reservoir system." Northwest Science. 2003; 77(1): 19-2

Topics: diet, predation
Publisher: WSU Press
Year: 2003
OAI identifier: oai:research.libraries.wsu.edu:2376/911
Provided by: Research Exchange
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