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Detection of PIT-tagged juvenile salmonids in the Columbia River estuary using pair-trawls, 2002
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2005
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[PDF-23.53 MB]
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Description:In 2002, we continued a study to detect juvenile anadromous salmonids Oncorhynchus spp. implanted with passive integrated transponder (PIT) tags using a large surface pair-trawl fitted with a PIT-tag detection antenna. In the Columbia River estuary at Jones Beach (river kilometer 75), we sampled for 693 h between 15 April and 31 July and detected 11,451 PIT-tagged juvenile salmonids of various species, runs, and rearing types. Not all stocks and rearing types were equally represented in the annual detection totals. For example, 16% of the detections were wild fish, with the remainder hatchery reared: 89% were Chinook salmon, 9% were steelhead, and the remaining 2% were other salmonid species.
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Rights Information:CC0 Public Domain
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