HomeFish encyclopediaRay-finned fishesPerch-like fishGobiesBiringo Biringo (Gymnogobius castaneus) Scientific name: Gymnogobius castaneus O'Shaughnessy, 1875 The Biringo (Gymnogobius castaneus) is a freshwater fish of the family Gobiidae. Native range: Asia, Japan and in the Kuril islands. BiologyDorsal spines (total): 8; Dorsal soft rays (total): 10; Anal spines: 1; Anal soft rays: 9Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnogobius castaneusFamilyGobiidae (Gobies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length8.0EnvironmentMarine; freshwater; brackish; demersal; amphidromousClimateTemperateDistributionAsia: Japan and in the Kuril islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, 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