HomeFish encyclopediaRay-finned fishesSalmonsSalmonidsMongolian grayling Mongolian grayling (Thymallus brevirostris) Scientific name: Thymallus brevirostris Kessler, 1879 The Mongolian grayling (Thymallus brevirostris) is a freshwater fish of the family Salmonidae. Native range: Europe and Asia, Russia and Great Lakes basin in Mongolia. BiologyDorsal spines (total): 4 - 8; Dorsal soft rays (total): 18-20; Anal spines: 3 - 4; Anal soft rays: 8 - 12Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameThymallus brevirostrisFamilySalmonidae (Salmonids)OrderSalmoniformes (Salmons)ClassActinopterygii (Ray-finned fishes)Maximum length39.0EnvironmentFreshwater; benthopelagicClimateTemperateDistributionEurope and Asia: Russia and Great Lakes basin in Mongolia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (K=0.29; tm=5-6) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026