We examined the hypothesis that sounds produced by odontocetes can debilitate fish by testing the effects of three odontocete‐like pulsed signals on three individuals of each of three fish species: sea bass, cod, and herring. We used a high‐frequency click with a center frequency of 120 kHz exposing the fish to approximately 112 dB, a mid‐frequency click with a center frequency of 70 kHz and 208 dB exposure level, and a low‐frequency click with a center frequency of 40 kHz and 193 dB exposure level. Individual fish were placed in a 0.3‐m‐diam net enclosure immediately in front of a transducer. Each fish was allowed to remain in the experimental set up for at least 3 min prior to exposure to the clicks which were presented at a rate of 100 pulses/s grading to 700 pulses/s in 1.1, 2.2, and 3.3 s. Sea bass were also exposed to a constant pulse rate of 700 pulses/s for exposures of up to 30 s. No effect was observed in any of the fish for any signal type or pulse modulation rate. Based on our results, the hypothesis that acoustic signals of odontocetes alone can disorient or stun prey cannot be supported.
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Testing the acoustic prey debilitation hypothesis: No stunning results
Kelly Benoit‐Bird, Whitlow Au, Ronald Kastelein, Sander van de Huel; Testing the acoustic prey debilitation hypothesis: No stunning results. J. Acoust. Soc. Am. 1 October 2004; 116 (4_Supplement): 2504. https://doi.org/10.1121/1.4784994
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