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Research related to transportation of juvenile salmonids on the Columbia and Snake Rivers, 2004: final report for the 2001 spring/summer chinook salmon juvenile migration
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2005
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[PDF-4.75 MB]
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Description:Since 1995, the National Marine Fisheries Service has evaluated transportation of Snake River spring/summer Chinook salmon smolts. Beginning in 2002, spring Chinook salmon transportation was also evaluated from McNary Dam using fish PIT-tagged at upper Columbia River hatcheries. From March to August 2004, we recovered age-3-ocean spring/summer chinook salmon adults from smolts tagged at Lower Granite Dam in 2001, completing adult returns from that study year. In 2001, we tagged only wild fish, and because of record low flows, all fish were placed in barges at Lower Granite Dam. No inriver group was tagged. In 2004 we detected 25 wild age-3-ocean transported fish at Lower Granite Dam. Based on combined returns from the 2001 marking (jacks through age-3-ocean fish), the smolt-to-adult return rate (SAR) of transported fish was 0.96 (95% confidence interval 0.84,1.11). As in previous years, SARs were variable over the course of the juvenile migration.
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Rights Information:CC0 Public Domain
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