Piranhas communicate with sound when they feel under threat.

Posted by Kyle Betts:    Lead researcher Eric Parmentier from the University of Liege, Belgium
knew that red-bellied piranhas made sounds, but wanted to know why they made these
sounds. Dr. Parmentier stated “Eventually, if we understand the behavior
that’s associated with the sounds, we might be able to listen to the sea and
explain to fishermen: ‘Now’s not the best time to start fishing’.” Dr. Parmentier
and his colleagues put an underwater microphone called a hydrophone into a tank
of piranhas in their lab and filmed the fish as they interacted. They recorded
three distinct sounds that the piranha made towards each other. The first was a
bark that the fish produced when they confronted one another face to face but
not fighting. The other two sounds they made was a drum-like percussive beat, which
they produced when they chased one another. They made a softer croak
when they would bite each other. Dr. Parmentier explained that “For
animals, it’s less expensive [in terms of energy] to make a lot of noise and
impress the other guys, rather than fight.” Here is a link to hear the
different noises that the piranhas make towards each other https://www.bbc.co.uk/news/science-environment-15295054



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