HomeFish encyclopediaRay-finned fishesKnifefishesGhost knifefishesStewart?s tube-snouted ghost knifefish Stewart?s tube-snouted ghost knifefish (Sternarchorhynchus stewarti) Scientific name: Sternarchorhynchus stewarti de Santana & Vari, 2010 The Stewart?s tube-snouted ghost knifefish (Sternarchorhynchus stewarti) is a freshwater fish of the family Apteronotidae. Native range: South America, rivers of south-eastern Peru and eastern Ecuador. Species factsScientific nameSternarchorhynchus stewartiFamilyApteronotidae (Ghost knifefishes)OrderGymnotiformes (Knifefishes)ClassActinopterygii (Ray-finned fishes)Maximum length22.9EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: rivers of south-eastern Peru and eastern Ecuador.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