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Naked-back knifefish

naked-back knifefishes
(image here)
Scientific classification
Electrophorus (electric eel)

The naked-back knifefishes are a family (Gymnotidae) of knifefishes that do not have a dorsal fin. They are found only in freshwaters of Central America and South America. All have electric organs.

The family is small, with just 19 species in two genera. The sole member of Electrophorus is the electric eel, while Gymnotus includes some of the most abundant knifefish found in the Amazon.

The Gymnotus knifefishes live in the leaf litter along river banks, in root mats, and in flooded meadows. They are nocturnal predators feeding on insects, crustaceans, and other fish. They generate weak electric fields that are still under study, but seem to be used in locating objects and possibly for communication.

Genus Electrophorus:

Genus Gymnotus: