WWRC 93-14
Mortality of Juvenile American Shad and Striped Bass Passed through Ossberger Crossflow Turbines at a Small-Scale Hydroelectric Site
Abstract
A full-recovery technique was used in mortality experiments conducted with juveniles
of American shad Alosa sapidissima and striped bass Morone saxatilis passed through Ossberger
crossflow turbines to obtain antecedent information about their fish passage characteristics. Immediate
turbine-induced mortality was 66% for 85-mm-long (total length) American shad. Turbine-induced
mortality of striped bass was significantly related to the total length of the fish and ranged
from 16% for 67-83-mm-long fish to 39% for 136-mm-long fish immediately after passage; after
24 h, turbine-induced mortalities of these two size-groups were 61 and 72%, respectively. The
mortality of striped bass was not affected by power output (320-600 kW) of the turbine or by
turbine size (650 versus 850 kW). Because of high mortality of control fish, the full-recovery
technique was not fully adequate for obtaining reliable delayed-mortality estimates for these fragile
fish species.
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