HomeFish encyclopediaLampreysLampreysLampreysKlamath river lamprey Klamath river lamprey (Lampetra similis) Scientific name: Lampetra similis Vladykov & Kott, 1979 The Klamath river lamprey (Lampetra similis) is a freshwater fish of the family Petromyzontidae. Native range: North America, Klamath River drainage and Klamath Lake in southern Oregon and northern California in USA. BiologyOccurs in large rivers, impoundments and lakes. Parasitic.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLampetra similisFamilyPetromyzontidae (Lampreys)OrderPetromyzontiformes (Lampreys)ClassCephalaspidomorphi (Lampreys)Maximum length27.0Common length19.2EnvironmentFreshwater; demersal; non-migratoryClimateTemperateDistributionNorth America: Klamath River drainage and Klamath Lake in southern Oregon and northern California in USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceLow, minimum population doubling time 4.5 - 14 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