What is a piranha size?

Piranhas are a diverse group of fish that range in size from tiny species, such as the red-bellied piranha (Pygocentrus nattereri), which only grows to about 25 cm (10 inches) in length, to larger species, such as the black piranha (Serrasalmus rhombeus), which can reach up to 130 cm (51 inches) in length.