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Delayed Migrations of Yearling Chinook Salmon Since Completion of Lower Monumental and Little Goose Dams on the Snake River
Author(s) -
Bentley Wallace W.,
Raymond Howard L.
Publication year - 1976
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1976)105<422:dmoycs>2.0.co;2
Subject(s) - chinook wind , oncorhynchus , goose , fishery , fish <actinopterygii> , environmental science , geography , biology , ecology
Travel time for yearling chinook salmon (Oncorhynchus tshawytscha) to migrate the 370 km downstream from the Salmon River to Ice Harbor Dam was compared during 3 years prior (1966–68) and 4 years after (1970–74) impounding of the Snake River behind Lower Monumental and Little Goose dams. Prior to impounding, fish averaged 15 days of travel time to Ice Harbor Dam during low flows (1,000–2,000 m 3 /s) and 9 days during moderate flows (2,300–4,000 m 3 /s). After the new impoundments, average travel time was increased to 31 days in low flows and 20 days in moderate flows–a measured delay of 16 and 11 days, respectively.