Gymnarchidae

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Gymnarchidae (subclass Actinopterygii, order Mormyriformes) A monotypic family that comprises the freshwater fish Gymnarchus niloticus. It has an eel-like body, small eyes, a very long dorsal fin, and pectoral fins; the pelvic and anal fins are absent. This fish grows to a length of at least. 1.2 m, and can produce low-voltage electric currents using modified muscles in the tail region. It is found in tropical Africa.