The black piranha (Serrasalmus rhombeus), is a species of freshwater piranha found in northern South America. It is the largest species of piranha, with a distinct rhombus-shaped body that can range in color from grey to nearly black. One defining feature of this species is its red eyes. Juveniles may have a more mottled appearance, which becomes less pronounced as they mature into adults with a darker grey or black coloration. The maximum standard length recorded for this species is between 41.5 to 61 centimeters, with a normal length around 32 centimeters and a maximum weight of 3.0 kilograms.
Distribution: The redeye piranha is primarily found in northern South America, specifically in the drainage systems of the Amazon and Orinoco rivers, as well as the Essequibo River and other rivers within the Guiana Shield region and northeastern Brazil. Although it was introduced to Florida at one point, it is now considered extirpated from that area.
