Elasmobranchs are an evolutionarily ancient group of cartilaginous fishes that can hear underwater sounds but are not historically viewed as active sound producers. Three recent reports of several species of rays producing clicks in response to approaching divers have cast doubt on this long prevailing view and resulted in calls for more research into sound production in elasmobranchs. This study shows that the rig, Mustelus lenticulatus, produces clicks (mean SPLrms = 156.3 dB re. 1 μPa ± 0.9 s.e.m. at approx. 30 cm) when handled underwater, representing the first documented case of deliberate sound production by a shark
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Source: Evidence of active sound production by a shark | Royal Society Open Science
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