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The 48 h survival of emigrating juvenile blueback herring (Alosa aestivalis) was estimated at 96 ± 6.7 percent in passage through a Kaplan-type turbine and at 88.3 ± 10.7 percent (90 percent confidence interval) over a spiliway (3.7 m high and spillage of 1.2 m3/s) of a low-head hydro darn (8.3 m). These results suggest that diversion of juvenile alosids over spiliways may not be assumed to be a totally benign strategy without obtaining sitespecific data. A remarkable similarity in survival rates of fish observed through turbine routes in this study and others suggests that these trends may be common. However, due to a lack of sufficient data, such a conclusion cannot be made for survival over spillways. (KEY TERMS: hydrobiology; fish survival; spillway; turbines; anadromous fish; fish passage; restoration, dams.) 157 WATER RESOURCES BULLETIN 3.7 m Mathur, Heisey, McGrath, and Tatham

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