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Many fish and amphibian species use sounds for communication in a wide range of behavioral and environmental contexts. The behaviors most often associated with acoustic communication in both groups include territorial behavior, mate finding, courtship, and aggression. Unlike most other communication channels (eg, chemical, visual, touch), sound provides a means for long-distance communication as well as for communication in areas where there is poor visibility. Both fishes and frogs tend to use fairly broad-band pulsed sounds, although in both groups there are species known to use narrow bands of noise or even relatively pure tones.

Although there are a number of similarities in the uses and features of sound in both fishes and amphibians, direct comparisons between the groups is difficult for several reasons. Of these, the most significant is the substantial difference in what we know about acoustic …