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These fish have villiform (brush-like) teeth on the upper and lower jaws. The snout is relatively short. The eyes are relatively large, with a diameter equal to or greater than the distance between nares. The anal fin originates at the isthmus (the strip of flesh on the ventral surface between the gill covers).
Eigenmannia is a genus of fish in the family Sternopygidae (glass knifefishes) native to tropical and subtropical South America (south to the Río de la Plata Basin), and Panama. [ 1 ] [ 2 ] They are typically found in slow-flowing streams, along the edge of large rivers, in deep river channels and in floodplains, and the genus also includes E ...
Knifefish may refer to several knife-shaped fishes: The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families: Family Gymnotidae (banded knifefishes and the electric eel) Family Rhamphichthyidae (sand knifefishes) Family Hypopomidae (bluntnose knifefishes) Family Sternopygidae (glass and rat-tail knifefishes)
The appendix on the body has black lines running through the bottom of the sides, with the most intense line running on the anal fin. Like all members of its order, it is distinguished by its ability to produce electric fields. This is achieved by discharging an electric organ in the tail. [2]
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]
English: Electroreception of capacitative and resistive objects in glass knifefish. The fish emits a continuous wave from its electric organ; the signal detected by its electroreceptors is modified by the electrical properties of the objects around it.
The African knifefish, Gymnarchus niloticus – also called the aba aba [a] – is an electric fish, living at the bottoms of rivers and lakes.It is the only species in the genus Gymnarchus and the family Gymnarchidae, within the order Osteoglossiformes.
Gymnotus species are nocturnal and mainly feed on aquatic insects, crustaceans, small fish and other small animals, [9] but may also take plant material. [8] Being electric fish, they generate weak electric fields used for navigation, finding prey and communicating with other individuals of their species.