The Gymnarchus niloticus, also referred to as the aba aba, is an incredible fish containing a streamlined body, one dorsal fin, and a finless tail. As a nocturnal species with poor vision, the aba aba instead utilizes a weak electric field to determine its surroundings. Its dexterity with its elongated dorsal fin allows the aba aba to swim beautifully both forwards and backwards. Found in low, slow-moving waters with abundant vegetation, this fish is an incredible addition to any aquarium.

The aba aba can grow up to 5 feet in length, with a lifespan of about 8-15 years. This fish can be kept with other fish, as the aba aba is a relatively peaceful fish, although its tankmates should be equal or larger in size.