Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7597
Title: Detection of PIT-tagged juvenile salmonids in the Columbia River estuary using a pair-trawl, 2012
Author/Editor: Matthew S. Morris, Robert J. Magie, Jeremy P. Bender, Benjamin P. Sandford, Richard D. Ledgerwood
Publication Year: 2013
Publisher: National Marine Fisheries Service
Contracting Agency: Bonneville Power Administration. Portland, Oregon
Contract Number: 46273 Rel 3
Project Number: 199302900
Pages: 76

 In 2012, we continued a study to detect juvenile anadromous salmonids Oncorhynchus spp. implanted with passive integrated transponder (PIT) tags using a surface pair-trawl fitted with a PIT-tag detection system. We sampled along the navigation channel in the upper Columbia River estuary between river kilometers (rkm) 61 and 83. We deployed the trawl for a total of 951 h between 14 March and 30 July and detected a total of 16,732 PIT-tagged juvenile salmonids. These detections were comprised of 20% wild and 75% hatchery-reared fish (5% were of unknown origin). The species composition of all PIT-tagged fish detected in the trawl during 2012 was 34% spring/summer Chinook salmon, 11% fall Chinook salmon, 46% steelhead, 5% sockeye, 3% coho, and 1% unknown species.


Theme: Recovery and rebuilding of marine and coastal species
Foci: Develop methods to use physiological, biological and behavioral information to predict population-level processes.