A sinkfull of Black Piranha. Note: It is identical to the Red Bellied, but has no colored stomach and is just all dark grey.

The Black Piranha or Redeye Piranha (Serrasalmus rhombeus) is a species of Piranha from the family Characidae and the genus Serrasalmus. This fish is named from its habitat in the Amazon of soft blackwater, and because of the species color. This fish can grow about twice as big as the Red Bellied Piranha but a lot of the fishes habits and traits are near identical to it.