It is the name of a fish in Colombia, something like the Piranha, but larger, its flesh is exquisite. Other common names: grouper, black pacu, tambaqui, pacu, morocota. Its scientific name is Colossoma macroporum (for the black tambaqui) and Piaractus brachypomus (the Red tambaqui), also say pirapitinga. It belongs to the family Characidae.
