|Document Type:||Contract Report|
|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|
|Publisher:||National Marine Fisheries Service|
|Contracting Agency:||Bonneville Power Administration. Portland, Oregon|
|Contract Number:||46273 Rel 3|
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|
Develop methods to use physiological, biological and behavioral information to predict population-level processes.