HomeFish encyclopediaRay-finned fishesKnifefishesNaked-back knifefishesSpotted knifefish Spotted knifefish (Gymnotus maculosus) Scientific name: Gymnotus maculosus Albert & Miller, 1995 The Spotted knifefish (Gymnotus maculosus) is a freshwater fish of the family Gymnotidae. In the aquarium it needs water at 22–28°C (72–82°F). Native range: Central America. Spotted knifefish care at a glanceTemperature22–28°C (72–82°F) Species factsScientific nameGymnotus maculosusFamilyGymnotidae (Naked-back knifefishes)OrderGymnotiformes (Knifefishes)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; benthopelagicClimateTropicalDistributionCentral America.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026