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Susceptibility of Chinook Salmon Smolts to Bypass Systems at Hydroelectric Dams
Author(s) -
Giorgi Albert E.,
Swan George A.,
Zaugg Waldo S.,
Coley Travis,
Barila Theresa Y.
Publication year - 1988
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1988)008<0025:socsst>2.3.co;2
Subject(s) - chinook wind , oncorhynchus , salmo , fishery , hydroelectricity , juvenile , fish <actinopterygii> , biology , environmental science , ecology
Several hydroelectric dams in the Snake‐Columbia river system are equipped with submersible traveling screens that project into the turbine intakes. The screens are designed to divert juvenile migrant Pacific salmon Oncorhynchus spp. and steelhead Salmo gairdneri from the intake upward into gatewells and the ajoining central bypass system. Assays ofgill Na + ,K + ‐ATPase were performed on yearling chinook salmon O. tshawytscha collected during several routine fish guidance efficiency tests in 1985 and 1986. On three of the four sampling dates, gill Na + ,K + ‐ATPase levels were significantly higher in fish guided into the gatewell than in those not guided. These data suggest there is a relationship between the physiological status of smolting yearling chinook salmon and their susceptibility to guidance by traveling screens. Assessments of salmonid out‐migrations may be biased if they are based on samples from traveling‐screen guidance systems.