HomeFish encyclopediaRay-finned fishesKnifefishesGhost knifefishesAxelrod?s tube-snouted ghost knifefish Axelrod?s tube-snouted ghost knifefish (Sternarchorhynchus axelrodi) Scientific name: Sternarchorhynchus axelrodi de Santana & Vari, 2010 The Axelrod?s tube-snouted ghost knifefish (Sternarchorhynchus axelrodi) is a freshwater fish of the family Apteronotidae. Native range: South America, Brazil, Amazon Basin, Rio Tocantins (upper and lower portions of that river system). BiologyThis species is distinguished from its congeners by the following set of characters: a short gape that terminates posteriorly at, or slightly short of, the vertical through the anterior nares; no scales along the mid-dorsal region of the body as far posteriorly as the origin of the electroreceptive filament; anal-fin rays 200-217.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSternarchorhynchus axelrodiFamilyApteronotidae (Ghost knifefishes)OrderGymnotiformes (Knifefishes)ClassActinopterygii (Ray-finned fishes)Maximum length60.0EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: Brazil, Amazon Basin, Rio Tocantins (upper and lower portions of that river system).Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026