red belly pacu or piaractus mesopotamicus

red belly pacu piaractus mesopotamicus swimming alone river species animals one specimen closeup eye gill scales smallscaled parana south american rayfinned fish paraguay aquaculture activities chato robust ovoid shape flattened laterally dark grey white yellow breast omnivore flooded forests warm waters vertical freshwater fluvial fauna biodiversity organisms underwater aquatic life nature captivity aquarium tank vegetation coldblooded gambitana morocoto cachama mbirai pitai