Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7598
Title: Detection of PIT-tagged juvenile salmonids in the Columbia River estuary using a pair-trawl, 2013
Author/Editor: Matthew S. Morris, Robert J. Magie, Jeremy P. Bender, Benjamin P. Sandford, Richard D. Ledgerwood
Publication Year: 2014
Publisher: National Marine Fisheries Service
Contracting Agency: Bonneville Power Administration. Portland, Oregon
Contract Number: 46273 Rel 58
Project Number: 1993-029-00

 In 2013, we continued a multi-year 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 889 h between 25 March and 25 July and detected a total of 22,879 PIT-tagged juvenile salmonids. These detections were comprised of 19% wild and 79% hatchery-reared fish (2% were of unknown origin). The species composition of all PIT-tagged fish detected in the trawl during 2013 was 45% spring/summer Chinook salmon, 5% fall Chinook salmon, 41% steelhead, 4% sockeye, 3% coho, less than 1% cutthroat trout, 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.