Top Shark underwater documentary 2020: Nature#coral reef
Channel: Alfa wolf
Date: 2020-04-24

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Best Ocean Life 2020: Shark

Acoustic methods for modifying the behaviour of marine animals are particularly appealing since sound stimuli can propagate much further than any chemical, electrical or visual cue. However, sound-induced behavioural changes in sharks are poorly understood. Previous studies have focused on the effects of sounds on marine mammals and bony fishes, both in a conservation context and as a way to control an animal’s behavior. Anthropocentric noise in the ocean has been shown to affect foraging, vocalization, and movement of marine mammals. Similarly, bony fishes have been shown to display changes in movement patterns, feeding behavior, social interactions, and anti predator behavior as a consequence of anthropocentric noise. Following these observations, sound has been used successfully as a non-physical barrier to fish movement, for example to deter them from entering the water intakes of power plants and dams . Similarly, Acoustic Deterrent Devices (ADD) that produce intense aversion sounds are increasingly being used as way to deter depreciating species, typically pinstripes, from aquaculture facilities. Only a handful of studies in the 1960–70 s investigated the potential for attracting or deterring sharks with sound. Low frequency and pulsed sounds appear to be attractive to sharks, whereas withdrawal behavior has been observed in sharks exposed to orcs calls and abrupt, loud, irregular sounds. Myrberg et al.20 described the withdrawal response of silky sharks, Carcharhinus falciformis, using playback of orca calls and an artificial irregularly pulsed noise-band (0.5–4 kHz). These results were also observed with documentaries coral reef marine biology captive lemon sharks, Negaprion brevirostris; the amplitude of the signal and the rate at which that amplitude was achieved (onset) determined whether a shark would initiate an approach, continue its approach or suddenly withdraw from a sound source.

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