There are nine species of freshwater hatchetfish from three genera: Carnegiella, Gasteropelecus, and Thoracocharax.
, any member of two unrelated groups of hatchet-shaped fishes—deep-sea forms of the family Sternoptychidae or freshwater fishes of the family Gasteropelecidae.
Freshwater hatchet fish require an intermediate level of care. However, if you give them the right water conditions, they can thrive in an aquarium. On top of this, they are supremely interesting fish. They are, for instance, flying fish -- they use their fins as wings to catch air jumping from the water.
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Freshwater hatchetfish - Wikipedia
The deep sea hatchetfish gets its name from the distinct hatchet-like shape of its body. It is a member of the Sternoptychidae family of deep sea fishes. There are about 45 individual species of hatchetfish that vary in size from one to six inches. They are most well known for their extremely thin bodies which really do resemble the blade of a hatchet. They should not be confused with the freshwater hatchetfish commonly seen in home aquariums.Hatchetfish are some of the more unique looking fish species available to freshwater hobbyists. They get to a couple of inches in size and some have the ability to fly or jump out of the water. They are a top dwelling fish and along with their known jumping habits an aquarium with a tight fitting hood is definitley needed to keep them from carpet surfing.The Gasteropelecidae or freshwater Hatchetfish family is found exclusively in South Americaand includes the genera and These fish have the unique abilityto glide over the water surface by rapidly beating its pectoral fins.The common hatchetfish (Gasteropelecus sternicla), also known as the river hatchetfish, and the silver hatchetfish, is a freshwater fish with a uniquely shaped body. However, the name silver hatchetfish is actually a misnomer, and should be used instead to describe . The name hatchetfish originates from its laterally compressed body, which resembles the head of a hatchet.Black-winged Hatchetfish (Carnegiella marthae) …a species of freshwater hatchetfish (Gasteropelecidae) that is native to South America, Primarily the Rio Negro and the Orinoco. Like other freshwater hatchetfish C. marthae lives close to the water’s surface and feed mainly insects, which are caught by jumping and gliding out of the water.This species spends almost all of its time at or just below the water surface, although it will sometimes retreat into midwater if threatened or feeding. Like other freshwater hatchetfishes, it is renowned for its ability to leap from the water surface and glide for distances of several metres. This behaviour is used both to catch flying insects, and to escape potential predators.