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Sand knifefish are freshwater electric fish of the family Rhamphichthyidae, from freshwater habitats in South America. [1] Just like most part of the members of the Gymnotiformes group, they also have elongated and compressed bodies and electric organs. The long anal fin actually extends from before the pectoral fins to the tip of the tail.
Despite the name, the electric eel is a type of knifefish. The Gymnotiformes / dʒ ɪ m ˈ n ɒ t ɪ f ɔːr m iː z / are an order of teleost bony fishes commonly known as Neotropical knifefish or South American knifefish. They have long bodies and swim using undulations of their elongated anal fin.
Eigenmannia vicentespelaea is a species of weakly electric knifefish in the family Sternopygidae.Native to the São Domingos karst area in central Brazil, it is the only known knifefish to exclusively inhabit caves.
Cymolutes lecluse, the sharp-headed wrasse or Hawaiian knifefish, is a species of marine ray-finned fish from the family Labridae, the wrasses. It is endemic to the Hawaiian Islands where it is found in lagoons over sandy substrates and is piscivorous. [2] It is found at depths of between 5–119 metres (16–390 ft). [1]
The clown featherback (Chitala ornata), also known as the clown knifefish and spotted knifefish, is a nocturnal species of tropical fish with a long, knife-like body. This knifefish is native to freshwater habitats in Cambodia, China, Hong Kong, Laos, Macau, Thailand, and Vietnam, [2] but it has also been introduced to regions outside its native range. [1]
The naked-back knifefishes are a family (Gymnotidae) of knifefishes found only in fresh waters of Central America and South America.All have organs adapted to electroreception.
With the denotation of "knifefish", the notopterids should not be confused with Gymnotiformes, the electric knifefishes from South and Central America. Although their manner of swimming is similar and they are superficially similar in appearance, the two groups are not closely related.
The Hypopomidae are a family of fishes in the order Gymnotiformes known as the bluntnose knifefish.They may also be called grass or leaf knifefishes. [1] These electric fish are not often eaten, of little commercial importance, rarely kept as aquarium fish, and poorly studied; however, species in this family may constitute a significant fraction of the biomass in the areas they inhabit.