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Associations among Fish Length, Dam Passage History, and Survival to Adulthood in Two At‐Risk Species of Pacific Salmon
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2019
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Source: Transactions of the American Fisheries Society, 148(6), 1069-1087
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Journal Title:Transactions of the American Fisheries Society
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Description:Threatened or endangered salmon and steelhead originating in the Snake River basin must pass through a series of eight major hydroelectric dams during their seaward migration. Understanding the effects of speci fic dam passage routes on lifetime survival for these stocks is essential for successful management. Juvenile fish may pass these dams via three primary routes: (1) spillways, (2) turbines, or (3) juvenile bypass systems, which divert fish away from tur- bines and route them downstream. Bypass systems may expose fish to trauma, increased stress, or disease. However, numerous studies have indicated that direct survival through bypass systems is comparable to and often higher thanthat through spillways. Some researchers have suggested that the route of dam passage affects mortality in the estuaryor ocean, but this is complicated by studies finding that fish size affects the route of passage. We tested whether pas-
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Source:Transactions of the American Fisheries Society, 148(6), 1069-1087
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ISSN:0002-8487;1548-8659;
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Rights Information:CC0 Public Domain
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Rights Statement:This article is a U.S. Government work and is in the public domain in the USA.
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