Heterocharacinae

species of fish

species of fish

species of fish

Heterocharax is a genus of freshwater ray-finned fishes belonging to the family Acestrorhynchidae, the biting tetras and freshwater barracudas. The species in this genus are found in South America.

Gnathocharax, is a monospecific genus of freshwater ray-finned fish belonging to the family Acestrorhynchidae, which includes the freshwater barracudas and the biting tetras. The only species in the genus is Gnathocharax steindachneri, also known as the arowana tetra. This fish is found in tropical freshwater habitats in the Orinoco and Amazon basins of South America.