Title

Turbine-Passage Mortality of Juvenile American Shad at a Low-Head Hydroelectric Dam

Publication Date

1994

Keywords

Alosa sapidissima, American shad, Connecticut River, Hadley Falls, Holyoke, hydroelectric, hydroelectric dams, juvenile, Kaplan turbine, Massachusetts, mortality, recapture, shad, tag-recapture technique, turbine passage, turbines, wicket gate

Journal or Book Title

Transactions of the American Fisheries Society

Abstract

The immediate (1-h) turbine-related mortality of juvenile American shad Alosa sapidissima at the Hadley Falls Hydroelectric Station on the Connecticut River, Holyoke, Massachusetts, was estimated to be 0% +/- 14.5% (95% confidence interval) at the 35% wicket gate opening and 2.7% +/- 16.2% at the 100% opening. We used the HI-Z Turb'N tag-recapture technique, which helped minimize control mortality and maximize recapture rates. Earlier literature estimates of turbine-related mortality (up to 82%) of juvenile alosids in passage through Kaplan turbines, in our view, were substantially overstated due to either low recapture rate, high control mortality, or both.

Pages

108-111

Volume

123

Issue

1

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