The redtail catfish, Phractocephalus hemioliopterus, is a pimelodid (long-whiskered) catfish named for its orange-red caudal fin. In Venezuela it is known as cajaro and in Brazil it is known as pirarara. It is the only extant species of the genus Phractocephalus. This fish originates from South America in the Amazon, Orinoco, and Essequibo river basins. Despite reaching 1.8 m (5 ft 11 in) in length and 80 kg (180 lb) in weight, this fish is a common aquarium fish. This fish also has a hybrid with the Tiger Shovelnose Catfish.