piranha

Any of various tropical American freshwater fishes of several genera, especially Serrasalmus and Pygocentrus, that have sharp teeth and are known for attacking and feeding on live animals.

Any of the carnivorous freshwater fish living in South American rivers and belonging to the families of Serrasalmus and Pygocentrus.

small voraciously carnivorous freshwater fishes of South America that attack and destroy living animals

someone who attacks in search of booty