Gymnarchidae

Aba

Gymnarchus niloticus

Rat tail fin lacking pelvic fins

• Tropical
• Regional distribution
• Freshwater fish
• Africa
• Elongated
• Large
• Tropical fish

Gymnarchus niloticus – the aba, aba aba or frankfish – is an electric fish, living at the bottoms of rivers and lakes. It is the only species in the genus Gymnarchus and the family Gymnarchidae, within the order Osteoglossiformes. It is a long slender fish with no pelvic or anal fins, and a tail fin shaped like a rat's tail.