males of at least G. carapo will mouthbrood.

Appearance

Gymnotus are generally brownish with a banded pattern, but this can also be more mottled or spotted in some species. Small scales are always present on these fish. The mouth is superior, meaning it is turned upwards. The anal fin terminates at a point near the tip of the tail. Like other Neotropical knifefish, they often lose their tail due to attacks by predators

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