Gymnotidae (Naked-back Knifefish)

The naked-back knifefishes are a family (Gymnotidae) of knifefishes found only in fresh waters of Central America and South America. All have organs adapted to the exploitation of bioelectricity. The family has 40 valid species in two genera. These fish are nocturnal and mostly occur in quiet waters from deep rivers to swamps. In strongly flowing waters, they may bury themselves.
Check out Wikipedia for more details!
== Genus and Species ==
* Electrophorus
** E. electricus (Electric Eel)