Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 4961
Title: Diversion of salmonid smolts tagged with passive integrated transponders from an untagged population passing through a juvenile collection system
Author: D. M. Marsh, Gene M. Matthews, Steve Achord, T. E. Ruehle, Benjamin P. Sandford
Publication Year: 1999
Journal: North American Journal of Fisheries Management
Volume: 19
Issue: 4
Pages: 1142-1146

We evaluated a system to divert salmonid smolts tagged with passive integrated transponders (PIT) from the general migrant population as they passed through a juvenile collection system at a hydroelectric dam on the Snake River.  Our goal was to maximize the diversion of PIT–tagged fish while simultaneously minimizing the diversion of untagged fish.  The slide–gate system that was tested diverted 81% of PIT–tagged fish detected.  The number of untagged fish entering the diversion system with every PIT–tagged fish was proportional to fish abundance and averaged one untagged fish for every PIT–tagged fish.  Measures of descaling, injury, and mortality for all fish in the diversion system were similar to those for fish that were not diverted.  These results established our basic PIT–tag diversion system as a major tool for conducting research on Snake River anadromous salmonids. 

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