HomeFish encyclopediaRay-finned fishesCharacinsDistichodontidaeGrass-eater Grass-eater (Distichodus rostratus) Scientific name: Distichodus rostratus G?nther, 1864 The Grass-eater (Distichodus rostratus) is a freshwater fish of the family Distichodontidae. In the aquarium it needs water at 22–28°C (72–82°F). Native range: Africa, Senegal to the Chad basin. Absent in coastal basins between Gambia and Sassandra (C?te d'Ivoire) but and report otherwise. Also found in the Nile. Grass-eater care at a glanceTemperature22–28°C (72–82°F) BiologyMarco-herbivores, feed on submerged plants, Eichornia roots and periphyton.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameDistichodus rostratusFamilyDistichodontidaeOrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length76.0EnvironmentFreshwater;; pH range: 6.5 - 7.5; dH range: ? - 15 demersal; potamodromousClimateTropicalDistributionAfrica: Senegal to the Chad basin. Absent in coastal basins between Gambia and Sassandra (C?te d'Ivoire) but and report otherwise. Also found in the Nile.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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