A small ultrasonic fish tag is described, which is useful in studies of the game and pan fishes of freshwater lakes. The device emits a continuous signal of from 14 to 20 hr duration, at a frequency of 65 kilohertz. With the receiving equipment described, 37 white bass, Roccus chrysops (Raf.), have been successfully tracked in Lake Mendota for periods up to 13 hr.
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