The Sensitivity of Fishes to Sound and to Other Mechanical Stimulation

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Abstract
This is a survey of the literature and contains no original data. The disagreement regarding hearing in fishes suggests that: (1) there are wide specific differences; (2) experimental technique has frequently been at fault. Some species may be deaf, but others hear and can discriminate tones. Lower tones affect the integumental nerve endings as do vibrations below a frequency known to us as sound. Stimuli of the latter sort aid the fish in orienting and blind fishes can avoid objects since these throw off a low-frequency "echo" of the water disturbances caused by the fishes'' own movements. There has been little work on sensitivity to hyrdostatic pressure, water currents, stroking, prodding, etc. There is a bibliography of 49 titles.

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