HomeFish encyclopediaRay-finned fishesKnifefishesGhost knifefishesGoeldi?s tube-snouted ghost knifefish Goeldi?s tube-snouted ghost knifefish (Sternarchorhynchus goeldii) Scientific name: Sternarchorhynchus goeldii de Santana & Vari, 2010 The Goeldi?s tube-snouted ghost knifefish (Sternarchorhynchus goeldii) is a freshwater fish of the family Apteronotidae. Native range: South America, main stream of the Amazon, from the region of ?bidos in Brazil, in the eastern portions of the Amazon basin westwards to north-eastern Peru. BiologyIn an aquarium environment, this species demonstrated increased activity levels at night, and only sporadic foraging activities in the course of the day.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSternarchorhynchus goeldiiFamilyApteronotidae (Ghost knifefishes)OrderGymnotiformes (Knifefishes)ClassActinopterygii (Ray-finned fishes)Maximum length30.6EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: main stream of the Amazon, from the region of ?bidos in Brazil, in the eastern portions of the Amazon basin westwards to north-eastern Peru.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