HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsSculpinsSlender sculpin Slender sculpin (Cottus tenuis) Scientific name: Cottus tenuis Evermann & Meek, 1898 The Slender sculpin (Cottus tenuis) is a freshwater fish of the family Cottidae. Native range: North America, occurs only in upper Klamath River drainage (upper Klamath Lake and upstream) in Oregon, USA. BiologyOccur over mud, sand and gravel on lake shores, and in riffles, runs and pools of creeks and small to medium rivers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCottus tenuisFamilyCottidae (Sculpins)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length9.0Common length7.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: occurs only in upper Klamath River drainage (upper Klamath Lake and upstream) in Oregon, USA.Conservation status (IUCN)Data deficient (DD)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