Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 9166
Title: An air-lift pump for sampling juvenile salmonids at John Day Dam
Author: Dean A. Brege, Winston E. Farr, Richard C. Johnsen
Publication Year: 1990
Journal: North American Journal of Fisheries Management
Volume: 10
Issue: 4
Pages: 481-483

An air-lift pump system was designed and constructed to sample juvenile salmonid accumulations in the turbine-intake gatewells of John Day Dam on the Columbia River.  A funnel concentrated fish into a 30.5-cm-diameter thin-walled pipe into which compressed air was delivered.  Fish were lifted from water depths of l 4-25 m to heights of 1-7.3 m above the water surface.  With a 14-m submergence and 1-m head, the sampling system operated continuously, dependably, and economically, providing hourly estimates of salmonid passage with little or no injury to fish.

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