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Sharks have a good reputation for being Silent killers The most important ocean predators are hidden hunters, but they also lack the organs producing sound in many other fish. Now, a pioneering new study revealed that the type of shark may be more bustle than previously thought, making noise similar to the balloon sound.
For the first time, scientists recorded evidence of Shark Rig – Mustelus Lenticulatus – producing a vote actively by picking up his teeth, according to research published on Tuesday in the magazine The royal society is open science.
“How sharks kept social groups or communication are body language to a large extent and perhaps through chemical signals; but for the largest part of mystery,” said Nil Hamerlaj, head of the Atlas Atlas Group and the CEO of the Shark Research Foundation, but for the largest part of the mystery, “Neil Hamerchlag aims to increase knowledge and reinforcement in the field of shark simulation and CEO. Hammerschlag did not participate in the search. “This study opens a completely new possibility to communicate with sound.”
the SharkA small type that inhabits the coastal waters of New Zealand, usually lives near the sea floor and plays a major role in the commercial fishing industry in the region. Unlike most fish that depend on Swimming bladder A gas-filled member helps fish in keeping its floating and produces and discovering the sound-sharks lack this feature, making noise production appear unlikely.
The main study author, Dr. Caroline Nider, initially became curious about the capabilities of the vocal shark after hearing the unexpected click sound during behavioral training experiences while obtaining a PhD at Auckland University in 2021. Nidar is now postponing a doctorate with T. Arant Mooney Labor at the Woods Hole in Massactors.
Although she was not able to investigate the mysterious click at the time, she got her attention. Now, Nider and her team reported great results from the study of 10 sharks events – five males and five females – caught on the New Zealand coast.
Make
The Rig Shark participated teeth are seen in the Oakland University experience that was conducted from May 2021 and April 2022. – Eric Parmante.
Scientists include sharks in large marine laboratory tanks, which are preserved with appropriate sea water conditions and food, from May 2021 to April 2022.
To record any carefully made sounds, the team transferred sharks to individual tanks equipped with underwater microphones or hydrops. When sharks were moved between tanks or kept gently, they began to make noise click, similar to those that NIEDER noticed years ago.
Each click was very short, as it lasted on average 48 milliseconds, and it is faster than the flash of human eye.
The researchers also identified the clicks as the wide range, which means that they occurred widely of frequencies from 2.4 to 18.5 kgz – some of which can be detected by humans, according to the study.
In terms of size, the clicks were intense, reaching about 156 decibels.
The study noted that most of the clicks occurred during the first 10 seconds of the handling, and became less frequent over time. During the ten secondary seconds, sharks were emitted by seven clicks on average, compared to the last ten seconds with only two clicks.
“The animals are accustomed to the daily trial protocol, then they stopped making the clicks completely, as if they were used to being in captivity and the experimental routine,” Nider said. “We have led this to think that we may watch an audio behavior instead of a strange artifact.”
The team also noticed that about 70 % of the clicks occurred when the shark was swinging alongside slowly, while about 25 % of the clicks occurred when the shark showed explosive movements, waving his head or body. Only 5 % of the movements occurred when the shark was not clearly moving its body, according to the study.
What causes unique shark to be interrupted?
With no organs specializing in the production of sound in these sharks, researchers are confident that the clicks come from their strong teeth together.
These teeth that resemble a plate, designed to crush prey, such as crustaceans, may be responsible for producing the distinctive click sound, similar to the sounds made by some fish by grinding their teeth.
Nidar said that the consistent style and the frequency of clicks also indicate that the sounds are deliberate, not transverse.
Researchers are still trying to investigate the exact cause of emission of these sounds. One of the possibilities is that the clicks are a distress signal, which can be a reaction to dealing with during the experiment.
Most of the clicks are located outside the hearing scope of the shark from the same fossil, which extends to about 800 hertz, according to the study. The researchers wrote that sharks do not use their vocal capabilities to communicate with each other, as it is possible that clicks are a warning signal or a form of aggression about the prey or in dangerous situations.
Vocal capabilities in natural habitats
With more than 500 species From sharks around the world, it is still unclear whether other sharks are involved in this ability to produce sound.
“I think there is a chance that other sharks make a similar noise,” Nider said. “These documents (we) can start listening to sharks, and we may know more interesting things about environmental science and their lifestyle in various environmental outlets.”
In addition, since the sounds were recorded in a censorship laboratory environment, researchers are eager to discover whether unique sharks also produce these noise in the wilderness and under any circumstances.
“This study opens the possibility of smaller shark to explore them.” “Although we do not really know whether the sound produced by sporadic sharks is just a secondary result to deal with them … it opens some questions, possibilities and new ways to search in the future.”
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