HomeFish encyclopediaLampreysLampreysLampreysMountain brook lamprey Mountain brook lamprey (Ichthyomyzon greeleyi) Scientific name: Ichthyomyzon greeleyi Hubbs & Trautman, 1937 The Mountain brook lamprey (Ichthyomyzon greeleyi) is a freshwater fish of the family Petromyzontidae. Native range: North America, Ohio River basin from southwestern New York to northern Alabama in USA. BiologyFound in gravel riffles and sandy runs of clean, clear high-gradient streams. Ammocoete larvae occur in sand, mud and debris in pools and backwaters. Non-parasitic.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameIchthyomyzon greeleyiFamilyPetromyzontidae (Lampreys)OrderPetromyzontiformes (Lampreys)ClassCephalaspidomorphi (Lampreys)Maximum length20.0Common length13.0EnvironmentFreshwater; demersalClimateTemperateDistributionNorth America: Ohio River basin from southwestern New York to northern Alabama in USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tm=2-4) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026