The family Gasteropelecidae consists of the Freshwater Hatchetfish. The Common hatchetfish is the most popular member of the family due to its popularity among fish keeping hobbyists. The family includes three genera: Carnegiella (4 species), Gasteropelecus (3 species), and Thoracocharax (2 species). They should not be confused with the Marine Hatchetfish, an unrelated family Sternoptychidae. Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ... Binomial name Gasteropelecus sternicla (Linnaeus, 1758) The Common Hatchetfish or River Hatchetfish (Gasteropelecus sternicla) is a tropical fish belonging to the Freshwater Hatchetfish family (Gasteropelecidae). ... See genus (mathematics) for the use of the term in mathematics. ... Genera  Argyropelecus  Polypipnus  Sternoptyx Marine hatchetfish are small, deep-sea bathypelagic fish of the family Sternoptychidae, together with bottlelights, pearlsides and constellationfish. ... Genera Subfamily Sternoptychinae - Marine hatchetfishes  Argyropelecus  Polypipnus  Sternoptyx Subfamily Maurolicinae  Araiophos  Argyripnus  Danaphos  Maurolicus  Sonoda  Thorophos  Valenciennellus Deep-sea hatchetfishes (Sternoptychidae) are a family of deep-sea fishes. ...

Freshwater hatchetfish have an enormously enlarged sternal region and large pectoral fins with massive associated muscles. Due to this, they are the only fish technically enabled for powered (as opposed to gliding, as in flyingfish) flight, although the exact degree to which this mechanism is actually used is not well researched. Albeit only for distances of a few meters and in a straight line, they can propel themselves out of the water and at least assist their flight by rapidly striking their pectoral fins to evade predators, or make shorter flying jumps to catch insects. Fish anatomy is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than does air. ... Genera Cheilopogon Cypselurus Danichthys Exocoetus Fodiator Hirundichthys Oxyporhamphus Parexocoetus Prognichthys The Exocoetidae or flyingfishes are a marine fish family comprising about 70 species grouped in 7 to 9 genera. ...

Genera

• Carnegiella
  • Carnegiella marthae - Blackwinged Hatchetfish
  • Carnegiella myersi - Pygmy Hatchetfish
  • Carnegiella schereri - Dwarf Hatchetfish
  • Carnegiella strigata - Marbled Hatchetfish
• Gasteropelecus
  • Gasteropelecus levis - Silver Hatchetfish
  • Gasteropelecus maculatus - Spotted Hatchetfish
  • Gasteropelecus sternicla - Common Hatchetfish
• Thoracocharax
  • Thoracocharax securis - Greater Hatchetfish
  • Thoracocharax stellatus - Spotfin Hatchetfish

The Carnegiella strigata, commonly known as the Marbled hatchetfish is a type of freshwater hatchetfish, with its origins in South America. ... Silver Hatchetfish The silver hatchetfish is a member of the family Gasteropelecidae, and the genus Gasteropelecus. ... Binomial name Gasteropelecus sternicla (Linnaeus, 1758) The Common Hatchetfish or River Hatchetfish (Gasteropelecus sternicla) is a tropical fish belonging to the Freshwater Hatchetfish family (Gasteropelecidae). ...

References

• "Gasteropelecidae." ITIS Standard Report. (Integrated Taxonomic Information System: National Museum of Natural History, Washington, D.C., 2004-10-29). ITIS 163118