Gymnarchus | 水產百科網

Gymnarchusniloticus–commonlyknownastheaba,abaaba,frankfish,freshwaterrat-tail,poisson-cheval,orAfricanknifefish–isanelectricfish,andtheonlyspeciesinthegenusGymnarchusandthefamilyGymnarchidae ...

Genus of ray-finned fishes

Gymnarchus niloticus – commonly known as the aba, aba aba, frankfish, freshwater rat-tail, poisson-cheval, or African knifefish – is an electric fish, and the only species in the genus Gymnarchus and the family Gymnarchidae within the order Osteoglossiformes. It is found in swamps, lakes and rivers in the Nile, Turkana, Chad, Niger, Volta, Senegal, and Gambia basins.[1][2]

G. niloticus has a long and slender body, with no caudal, pelvic, or anal fins. The dorsal fin is elongated, running along the back of the fish towards the blunt, finless tail, and is the main source of propulsion. It grows up to 1.6 m (5.2 ft) in length and 19 kg (42 lb) in weight.[3]

G. niloticus is nocturnal and has a poor vision. Instead, it navigates an...