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Research related to transportation of juvenile salmonids on the Columbia and Snake Rivers, 2001
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2003
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[PDF-12.22 MB]
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Description:Since 1995, the U.S. Army Corps of Engineers has funded annual research by the National Marine Fisheries Service to evaluate transportation of yearling Chinook salmon and steelhead smolts. During each study year, replicate groups of juvenile fish are either released to the tailrace of Lower Granite Dam to migrate in the river or transported to a release site below Bonneville Dam. Returning adults from replicates released in previous years are recovered, and ratios of adult returns from transported and inriver migrant groups are calculated. During 2001, we continued this work and began marking subyearling Chinook salmon from the Snake and Columbia Rivers to obtain contemporary transportation evaluations for these stocks. Because of expected low river flows and subsequent low survival rates for inriver-migrants, all migrants that entered juvenile collection systems at dams on the Snake River were diverted for transport. Replicate groups were released to migrate in the river only for Columbia River subyearling chinook salmon collected at McNary Dam.
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Rights Information:CC0 Public Domain
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