HomeFish encyclopediaLampreysLampreysLampreysSea lamprey Sea lamprey (Petromyzon marinus) Scientific name: Petromyzon marinus Linnaeus, 1758 The Sea lamprey (Petromyzon marinus) is a freshwater fish of the family Petromyzontidae. In the aquarium it needs water at 5–20°C (41–68°F). Sea lamprey care at a glanceTemperature5–20°C (41–68°F) BiologyVertebrae: 0. Anguilliform body. Presence of 7 branchial openings. Two separated dorsal fins, the second continuous with the caudal fin. Number of myomeres: 67-74. Brown-yellow colored on the dorsal and lateral part of the body, with black marblings.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePetromyzon marinusFamilyPetromyzontidae (Lampreys)OrderPetromyzontiformes (Lampreys)ClassCephalaspidomorphi (Lampreys)Maximum length120Common length60.0Depth range1–2200 m (3–7218 ft)EnvironmentMarine; freshwater; brackish; demersal; anadromous; depth range 1 - 2200 mClimateTemperateDistributionNortheast Atlantic: Norway including Iceland and the Barents Sea, south to northern Africa. Throughout the western Mediterranean but absent from eastern Mediterranean and the Black Sea. Western Atlantic: Labrador, Canada to Gulf of Mexico in Florida, USA. Landlocked in Great Lakes, Finger Lakes, Oneida Lake and Lake Champlain, Canada/USA. Appendix III of the Bern Convention.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: minor commercialResilienceLow, minimum population doubling time 4.5 - 14 years (K 0.16; tm=5-12; Relative Fec = 233) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026