[1] It is the most widespread species of Gymnotus,[1] but it has frequently been confused with several relatives, including some found outside its range like the Central America G.

[1] G. carapo occurs in virtually any freshwater habitat in its range, such as rivers and streams (both slow- and fast-flowing), floodplains, estuaries, swamps and lakes.

[7][9] They are highly territorial and will react aggressively if detecting the electric field of another individual of their species.

[10] G. carapo are nocturnal and eat benthos, such a worms, insects, crustaceans, small fish and plant material.

[7] The male takes care of the young by mouth brooding, and making and watching over a "nest", a depression in the bottom where the female lays the eggs.