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Detection of PIT-tagged juvenile salmonids in the Columbia River estuary using pair-trawls, 2007
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2010
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[PDF-24.27 MB]
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Description:In 2007, we continued a multiyear 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 antenna. We sampled in the upper Columbia River estuary between river kilometers (rkm) 61 and 83 for 1,144 h between 7 March and 19 July. During this time, we detected 19,470 PIT-tagged juvenile salmonids of various species, runs, and rearing types. Ofthese 19,470 detections 78% were Chinook salmon, 18% were steelhead, and 4% were other salmonid species or unknown species. For all species combined 17% ofthe total detections were wild fish, 81% were hatchery fish, and the remaining 2% were fish of unknown origin.
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Rights Information:CC0 Public Domain
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