Gasteropelecidae

The freshwater hatchetfish are a family, Gasteropelecidae, of ray-finned fish from South and Central America. The common hatchetfish is the most popular member among fish keeping hobbyists. The family includes three genera: Carnegiella (four species), Gasteropelecus (three species), and Thoracocharax (two species).

Carnegiella is a genus of freshwater ray-finned fishes belonging to the family Gasteropelecidae, the freshwater hatchetfishes. The fishes in this genus are found in the Amazon and Orinoco basins in South America. This genus contains some popular aquarium fishes.

Gasteropelecus is a genus of freshwater ray-finned fishes belonging to the family Gasteropelecidae, the freshwater hatchetfishes. The fishes in this genus are found in Central and South America.

Thoracocharax is a genus of freshwater ray-finned fishes belonging to the family Gasteropelecidae, the freshwater hatchetfishes. These fishes are found in the Amazon, Orinoco and Paraná basins in South America. These fish live just under the surface of the water.