“…In light of information that is available, generalizations concerning effects of underwater sound on freshwater fishes are often difficult to make (Platt and Popper 1981;Sand 1981). For example, among clupeids, alewife Alosa pseudohwn8gus avoided pulsed, low frequency sounds in the range of 50-60 Hlz at sound pressure levels of 180 dB re I ;Pa (Haymes and Patrick 1986). However, Dunning et aL (1992) found that alewives also avoided pulsed, high frequency sounds in the range of 110 kHz-150 kHz at sound pressure levels of 125-180 dB re I p Pa.…”