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The body is kept relatively rigid and there is very little motion of the center of mass motion during locomotion compared to the body size of the fish. [8] The caudal fin is absent, or in the apteronotids, greatly reduced. The gill opening is restricted. The anal opening is under the head or the pectoral fins. [11]
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.
The maximum discharge from the main organ is at least 600 volts, making electric eels the most powerful of all electric fishes. [45] Freshwater fishes like the electric eel require a high voltage to give a strong shock because freshwater has high resistance ; powerful marine electric fishes like the torpedo ray give a shock at much lower ...
Gymnotus is a genus of Neotropical freshwater fish in the family Gymnotidae found widely in South America, Central America and southern Mexico (36th parallel south to 18th parallel north). [1] The greatest species richness is found in the Amazon basin . [ 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]
They show signs of negative allometric growth, meaning they get slimmer as they increase in size. [12] The larval fish has an unusual arrangement of nerves in the head. [13] The fish's karyotype is either 2n=34 or 2n=54 chromosomes, reported from different locations, suggesting there could be two species in the genus. [9] [14]
They vary greatly in size, ranging from about 15 cm (6 in) in total length in the smallest species to 60 cm (2 ft) in the largest. [2] It has been claimed that Apteronotus magdalenensis is up to 130 cm (4.3 ft), [ 1 ] but this is not supported by recent studies, which indicate that it does not surpass about 50 cm (1.6 ft).
Apteronotus leptorhynchus is a ray-finned fish belonging to the Neotropical knifefish order Gymnotiformes. Brown ghost knifefish are within the Apteronotidae family, which are distinguished from other Gymnotiforms by the presence of a caudal tail. [4] Phylogenetic tree of the family Apteronotidae with the genus Apteronotus highlighted
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