Myletes edulis Myletes mesopotamicus Colossoma mitrei Colossoma canterai Colossoma mesopotamicus Piaractus mesopotamicus, the small-scaled pacu, Paraná River pacu or simply pacu (a name shared with other species), is a South American ray-finned fish that is native to the Paraguay-Paraná River basin,[3][4] but it has been introduced by aquaculture activities in a wider area.

[6] Piaractus mesopotamicus is a robust fish, with ovoid shape, flattened laterally.

Its colour is dark grey to silver, with a white belly and a yellow breast.

[3] The other member of its genus, P. brachypomus, can be distinguished by its larger scale-size[7] and the lower number of lateral scales (less than 110).

[5] Main food items for adults are nuts and seeds that fall from trees in flooded forests.