HomeFish encyclopediaLampreysLampreysLampreysOhio lamprey Ohio lamprey (Ichthyomyzon bdellium) Scientific name: Ichthyomyzon bdellium Jordan, 1885 The Ohio lamprey (Ichthyomyzon bdellium) is a freshwater fish of the family Petromyzontidae. Native range: North America, Ohio River basin from extreme southwestern New York west to northern Indiana and eastern Illinois and south to northern Alabama in USA. BiologyInhabit smaller, more upland rivers, and less encountered in reservoirs. Ammocoete larvae live near debris in muddy pools and backwaters. Known to parasitize suckers.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameIchthyomyzon bdelliumFamilyPetromyzontidae (Lampreys)OrderPetromyzontiformes (Lampreys)ClassCephalaspidomorphi (Lampreys)Maximum length30.0Common length19.2EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Ohio River basin from extreme southwestern New York west to northern Indiana and eastern Illinois and south to northern Alabama in USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tmax=tm=1) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026