Wimple Piranha (Catoprion mento)

Family: Serrasalmid Family (Serrasalmidae)

IUCN Conservation Status: Least Concern

A tiny (15cm/5.9 inches in length) relative of the more famous Red-Bellied Piranha, the Wimple Piranha is found in the Amazon, Orinoco, Paraguay and Essequibo river basins, and is notable for its unusual diet; adults of this species feed almost exclusively on fish scales, feeding by ramming into larger fish at high speeds with their mouths wide open, biting and generating suction to dislodge their target’s scales and pull them into their mouths. The practice of eating scales, known as lepidophagy, is rare in animals as scales are difficult to digest and require considerable amounts of energy to obtain, and it is likely that it developed in response to the intense competition between fish species in the biodiverse rivers to which Wimple Piranhas are native - although their nutrients-poor diet limits their size, feeding exclusively on scales (occasionally supplemented by small insects or small amounts of the meat of their otherwise unharmed targets where possible) allows Wimple Piranhas to find food while largely avoiding competing with larger and less specialised carnivores. Besides their unusual feeding habits little is known about the biology of wild Wimple Piranhas, although through the observation of captive individuals it has been found that unlike many piranha species they are solitary (possibly avoiding living in groups to avoid competing with other members of their species,) and that like other members of their family females of this species lay eggs.

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Image Source: https://www.inaturalist.org/taxa/342485-Catoprion-mento

Daily fish fact #609

Wimple piranha!

A good portion of this fish's diet consists of scales of other fish species and fellow wimple piranhas! They swim towards their target at great speeds and bite down on their side at collision, knocking off scales with their teeth and through the sheer force of the impact, but will also simply suck any freefloating scales into their mouth.

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