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    Responses in Bahamiam Sharks and Groupers, to Low-Frequency, Pulsed Sounds

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    Subject
    shark; reef; pelagic; grouper; Mycteroperca; pulse
    Author
    Nelson, Donald R.; Johnson, Richard H.; Waldrop, Larry G.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    68
    Issue
    scas/vol68/iss3; 3
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/10326
    Abstract
    Responses to low-frequency (50-200 Hz), pulsed sounds were observed in reef sharks (Ginglymostoma cirratum, Sphyrna tiburo), pelagic sharks (Carcharhiniis falciformis), and in several species of groupers (Mycteroperca bonaci, M. venenosa, and Epinephelus striatus). By three criteria for positive responses, (i) number present, (ii) closeness of approach to transducer, and (iii) attentiveness of behavior, sharks and groupers of reef areas scored higher during periods of sound playback than during control (quiet) periods. Pelagic silky sharks were attracted to low-frequency, pulsed sounds and apparently habituated to them on both an intra-daily and inter-daily basis. Acoustic responses were suspected when certain sharks and groupers were observed to be attracted to speared, struggling fish and to schools of fish feeding in an excited manner.
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