About 990 fish are known to produce sounds, but species such as rays, sharks and swordfish are known to be silent.
Until now, the scientists they believed that the skates they were silent creatures, but one new research identified at least two different types of sleds to produce sounds. This lucky discovery is due to videos that surfaced and surprised marine biologists.
“The fact that we have only now realized that this very common species makes sounds shows how little we still know about the oceans. We now have multiple recordings and observations of two species making sounds in their natural environment.”says Professor Lachlan Fetterplace of the University of Agricultural Sciences in Sweden.
🔊on! Stingrays: no longer the silent residents of the sea. Our new paper provides the 1st evidence of not one but TWO species of #stingray actively producing sounds https://t.co/0bPJpZpMHT @BWueringer @jdelgadoesteban @MotherOfRays @SLU_aqua @fish_thinkers @ESAEcology 1/ pic.twitter.com/uvObWfElM3
— Lachlan Fetterplace (@fiskeforbrains) July 19, 2022
About 990 fish are known to produce sounds, but species such as rays, sharks and swordfish are known to be silent. Two skates of the species Urogymnus granulatus and one Pastinachus ater were recorded by divers making short, sharp click-like sounds, which are probably warnings or a defensive signal. In fact, the tone of the click changes as they move.
Scientists believe that skates and their predators can hear these clicks, which range between 40 and 1,500 Hz. During the observations, the sounds started as the divers approached the dinghies and stopped as soon as the diver or the dinghy moved away.
But how is the sound produced by the relatively simple body of the sledgehammer? Scientists believe it is produced similar to the way people tap their fingers or make sounds with their tongues.
“We can’t be sure how the loons produce the sounds, but it seems to involve a rapid movement of the head or jaw and an opening behind the eyes that serves for breathing.”they mention.
Skunks are quite difficult to study because they are very agile and avoid humans. Despite the challenges, researchers will pursue more observations of the 1,200 known species of elasmobranchs.
The research was published in Ecology.
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