Piranha
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A piranha is any of a number of freshwater fish species in the subfamily Serrasalminae, of the family Serrasalmidae, in the order Characiformes. These fish inhabit South American rivers, floodplains,
Pygocentrus nattereri Karlsruhe Zoo 01
Piranha in Venezuela with its jaws held open to show its distinctive sharp teeth
Jawbone of Pygocentrus nattereri
Close-up of a piranha at Georgia Aquarium
Pacu
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Pacu is a common name used to refer to several species of omnivorous South American freshwater serrasalmid fish related to piranhas. Pacu and piranha do not have similar teeth, the main difference bei
Piranha
…Spanish-derived piraña, as well as the archaic piraya. Piranhas belong to the family Serrasalmidae, which includes closely related omnivorous fish such as pacus. Traditionally, only the four genera Pristobrycon, Pygocentrus, Pygopristis, and Serrasalmus are considered to be true piranhas, due to their specialized…
Pacu shedd
Colossoma macropomum (black pacu), at the New England Aquarium
19th century watercolor of a Pacu painted by Jacques Burkhardt
Colossoma macropomum, a pacu, for sale in the Manaus Fish Market, Brazil. This fish was approximately 85 cm (33+1⁄2 in) long.