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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.
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.
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.
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.
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 two recognized species are both small knifefish, with the largest being M. bilineatus at up to 12 cm (4.7 in) in total length. The other is M. brevis, which at up to only 5.3 cm (2.1 in) is the world's smallest knifefish. [2] [3] Microsternarchus are very similar to Brachyhypopomus. [4]
Cymolutes torquatus, the finescale razorfish, razor wrasse or collared knifefish, is a species of marine ray-finned fish from the family Labridae, the wrasses. It is a solitary wrasse of sandy flats which has a wide Indo-Pacific distribution.