The red-bellied piranha is an iconic freshwater predatory fish and is considered the most dangerous of the piranha family. It is native to South America in the river systems of the Amazon, Parana, and Essequibo. It is an attractive aquarium fish and likes the company of other piranhas, though this can be problematic when keeping piranhas with other fish species due to their aggressive nature. Piranhas require a relatively large tank with room to swim and fresh, or ideally, live food.