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Colossoma macropomum

Colossoma macropomum
Black Fin Pacu
The tambaqui (Colossoma macropomum) is a freshwater fish of the subfamily Serrasalminae, family Characidae. It is also known by the names pacu, black pacu, black-finned pacu, giant pacu, cachama and gamitana.
The tambaqui is the largest characin of South America. The tambaqui is found in the Amazon and Orinoco basins in its wild form. 
It may reach more than 1 metre in total length and 30 kilograms in total weight.
It is similar in shape to the piranha and is sometimes confused with the carnivorous fish; the pacu is tall and laterally compressed with large eyes and a slightly arched back. Body color is basic black to gray with spots and blemishes in its mid body. All the fins are black and the pectoral fins are small. Around 10 percent of a tambaqui's weight is fat. 
This species is usually solitary. Adults stay in flooded forests during the first 5 months of flooding and consume fruits and grains. Young and juveniles live in black waters of flood plains until sexual maturity. The tambaqui feeds on zooplankton, insects, snails, and decaying plants.