Abstract
An underwater television system located off Bimini, Bahamas, was used to observe and record the attraction of free-ranging sharks to a nearby sound source. Several species of sharks were attracted by irregularly pulsed signals either containing harmonics (e.g., overdriven sine waves) or consisting of octave bands of noise. Irregularly pulsed, pure tones and harmonic sounds above 1000 Hz were apparently not attractive. Attraction was not reinforced, and habituation of the approach response was regularly observed in prolonged test series. As the number of sharks in the test area increased, swimming activity rose dramatically. Circling and crisscrossing of the site became more intense under conditions of low ambient light and turbidity. Additional tests showed that minimum attractive sound levels were remarkably low, and that sharks could locate a sound source within seconds from distances beyond our limit of visibility (about 25 m).
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Communicated by G. L. Voss, Miami
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Myrberg, A.A., Banner, A. & Richard, J.D. Shark attraction using a video-acoustic system. Marine Biol. 2, 264–276 (1969). https://doi.org/10.1007/BF00351149
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DOI: https://doi.org/10.1007/BF00351149