The name hatchetfish may refer to three groups of fishes. Marine hatchetfishes, which are small deep-sea bioluminescent fishes (Stomiiformes) of the family Sternoptychidae, subfamily Sternoptychinae. Freshwater hatchetfishes, which are small South and Central American characins of the family Gasteropelecidae. Lastly, Triportheus, the elongate hatchetfish, small South American freshwater characins of the family Triporthidae. Learn more about Hatchetfish
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