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From Wikimedia Commons, the free media repository. Wikispecies has an entry on: Gymnarchus niloticus. Pages in category " Gymnarchus niloticus " This category contains only the following page. G Gymnarchus niloticus. Media in category " Gymnarchus niloticus " The following 11 files are in this category, out of 11 total. Gymnarchus Gymnarchus niloticus Gymnarchus niloticus cropped. Gymnarchus niloticus Gymnarque du Nil cropped.
Gymnarque du Nil. The fishes of the Nile Pl. XIII Namespaces Category Discussion. Views View Edit History. In other projects Wikimedia Commons. This page was last edited on 26 December , at Files are available under licenses specified on their description page. All structured data from the file and property namespaces is available under the Creative Commons CC0 License ; all unstructured text is available under the Creative Commons Attribution-ShareAlike License ; additional terms may apply.
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. 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. Instead, it navigates and hunts smaller fish using a weak electric field similar to that of the related elephantfish. Also like the elephantfish, it possesses an unusually large brain, which is believed to help it interpret the electrical signals. This produces a symmetrical electric field around its body.
Gymnarchus niloticus Cuvier, 1829