HomeFish encyclopediaRay-finned fishesCharacinsDistichodontidaeOneline tetra Oneline tetra (Neolebias trewavasae) Scientific name: Neolebias trewavasae Poll & Gosse, 1963 The Oneline tetra (Neolebias trewavasae) is a freshwater fish of the family Distichodontidae. In the aquarium it needs water at 24–28°C (75–82°F). Native range: Africa, Congo and Nile basins, coastal rivers from south Cameroon to Mayumbe. Oneline tetra care at a glanceTemperature24–28°C (75–82°F) BiologyMaximum TL was recorded at 5.3 cm. Occurs in fringing vegetation. Omnivorous browser, consumes plant fragments, algae, protozoans, rotifers, small crustaceans and insects.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeolebias trewavasaeFamilyDistichodontidaeOrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length4.1EnvironmentFreshwater;; dH range: ? - 12 pelagicClimateTropicalDistributionAfrica: Congo and Nile basins, coastal rivers from south Cameroon to Mayumbe.Conservation status (IUCN)Least Concern (LC)Threat 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