A piranha or piraña, native to the freshwater bodies of South America is largely known for their ferocious predatory behavior. Armed with a dangerous bite – actually one of the most forceful bites measured in vertebrates relative to their body mass – the piranhas are feared by even humans and they are portrayed in a very deadly light in the popular culture for their feeding frenzy. But even in the most intense piranha infested waters of South America, a big, meaty fish called Arapaima gigas co-exists successfully, with an impressive defense system against the deadly teeth of piranhas.
Arapaima gigas, one of the four species of the genus Arapaima, is native to the basin of the Amazon River. They have a streamlined body and often grow to a length of up to 10 feet and can weigh about 200 kg, which make them one of the world’s largest freshwater fishes. Also known as pirarucu, they are commonly found in Brazil, Peru and Guyana. They are air-breathers and can extract oxygen from the surface air, which allow the pirarucu to survive in oxygen-low waters.
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