PACÚ CHICO Myleus pacu The South American freshwater fish of the caracid family, subfamily Serrasalminae. It is of tropical habitat, mainly the Amazonian rivers, preferring waters between 22 and 28 °C. Its shape is ovoid. The pacu is omnivorous, but its main food is the fruits and berries that fall from coastal trees. Despite navigating the bottom, its food does not come from there.