HomeFish encyclopediaRay-finned fishesCarpsMinnows or carpsRedtail chub Redtail chub (Nocomis effusus) Scientific name: Nocomis effusus Lachner & Jenkins, 1967 The Redtail chub (Nocomis effusus) is a freshwater fish of the family Cyprinidae. BiologyInhabits clear rocky runs and pools of creeks and small rivers; also found in small, clear upland streams with predominantly gravel substrates.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNocomis effususFamilyCyprinidae (Minnows or carps)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length23.0Common length14.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: upper Green, upper Barren, Cumberland (in Little South Fork and downstream), Duck and lower Tennessee (between Cumberland and Duck Rivers) River drainages in Kentucky and Tennessee, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, 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