HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsFlathead chub Flathead chub (Platygobio gracilis) Scientific name: Platygobio gracilis Richardson, 1836 The Flathead chub (Platygobio gracilis) is a freshwater fish of the family Cyprinidae. BiologyInhabits sandy runs of small to large turbid rivers. Feeds mainly on terrestrial and aquatic insects, occasionally on small fishes. Spawning probably occurs from June to August.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePlatygobio gracilisFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length32.0Common length14.3EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Mackenzie, Saskatchewan, and Lake Winnipeg drainages in Canada; Missouri-Mississippi River basin from southern Alberta in Canada and Montana to Louisiana, USA; upper Rio Grande (including Pecos) drainage in New Mexico, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec=4,974) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026