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Hatchetfish
Fish - Fresh Water
The freshwater hatchetfishes are a family, Gasteropelecidae, of ray-finned fish. The common hatchetfish is the most popular member among fish keeping hobbyists. The family includes three genera: Carnegiella (4 species), Gasteropelecus (3 species), and Thoracocharax (2 species).
http://en.wikipedia.org/wiki/Freshwater_hatchetfish