HomeFish encyclopediaRay-finned fishesCatfishNorth American freshwater catfishesNeosho madtom Neosho madtom (Noturus placidus) Scientific name: Noturus placidus Taylor, 1969 The Neosho madtom (Noturus placidus) is a freshwater fish of the family Ictaluridae. BiologyOccurs in gravel riffles and runs of small to medium rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNoturus placidusFamilyIctaluridae (North American freshwater catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length8.7Common length4.2EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Arkansas River drainage in USA: Spring River in southwestern Missouri and southeastern Kansas; Cottonwood and Neosho rivers in eastern Kansas and northeastern Oklahoma; lower few miles of Illinois River in eastern central Oklahoma.Conservation status (IUCN)Lower Risk: near threatened (LR/nt)Threat to humansHarmlessResilienceHigh, 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