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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).
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]
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 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.
Black and White is a 1990 postmodern children's picture book by David Macaulay. Published by Houghton Mifflin Company, it received mixed reviews upon its release. It was the recipient of the Caldecott Medal for illustration in 1991. The book tells four overlapping stories, each drawn with a distinct visual style: "Seeing Things", about a boy on ...
Like the other gymnotiforms, gymnotids have classic knifefish bodies. The body is long and eel-like, the dorsal fin and pelvic fins are absent, and the anal fin is extremely long and used for movement.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.