HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsNaked osman Naked osman (Gymnodiptychus dybowskii) Scientific name: Gymnodiptychus dybowskii Kessler, 1874 The Naked osman (Gymnodiptychus dybowskii) is a freshwater fish of the family Cyprinidae. Native range: Asia. BiologyInhabits rivers and lakes. Feeds on small fish, amphipods, mollusks and insect larvae. Eggs and milt are poisonous.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnodiptychus dybowskiiFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length45.0Common length23.0EnvironmentFreshwater; benthopelagicClimateTemperateDistributionAsia.Conservation status (IUCN)Not EvaluatedThreat to humansOtherUsesFisheries: 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