Researchers have recorded what they believe to be the first evidence that sharks can produce sounds, according to a newly published study.
Scientists observed that Mustelus lenticulatus sharks, a small species found in New Zealand's coastal waters, produced clicking sounds when handled underwater. This is believed to be the first documented observation of an active sound made by a shark.
The study, which lasted over 11 months, involved ten small sharks – five females and five males. The sounds were recorded in a specially designed plastic experimental tank.
The research, led by Caroline Nieder of the Woods Hole Oceanographic Institution (USA), found that on average, sharks made significantly more clicking sounds during the first ten seconds of handling than during the following ten seconds.
Scientists believe the sound may come from the sharks' flat teeth clicking together.
They point out that the exact reason for these clicking sounds remains a mystery, but it could be a response to stress or discomfort. Further behavioral research will be needed to understand its exact meaning.
