Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 6997
Title: Underwater separation of juvenile salmonids by size
Author: Michael H. Gessel, Winston E. Farr, Clifford W. Long
Publication Year: 1985
Journal: Marine Fisheries Review
Volume: 47
Issue: 3
Pages: 38-43

Juvenile salmonids collected at dams on the Snake and Columbia Rivers require separation by size prior to transportation.  A method of separating most of the smaller downstream-migrating juvenile Pacific salmon, Oncorhynchus spp., from the larger steelhead, Salmo gairdneri, at hydroelectric dams is described.  The device utilizes behavioral responses that allow fish to remain in water during the separation process.  This system is presently being installed at collector dams on the Columbia and Snake River.