HomeFish encyclopediaLampreysLampreysLampreysMexican brook lamprey Mexican brook lamprey (Lampetra geminis) Scientific name: Lampetra geminis ?lvarez, 1964 The Mexican brook lamprey (Lampetra geminis) is a freshwater fish of the family Petromyzontidae. Native range: North America, Celio and Duero rivers in Mexico. Species factsScientific nameLampetra geminisFamilyPetromyzontidae (Lampreys)OrderPetromyzontiformes (Lampreys)ClassCephalaspidomorphi (Lampreys)Maximum length14.3EnvironmentFreshwater; demersal; non-migratoryClimateTropicalDistributionNorth America: Celio and Duero rivers in Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec=900-3460) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026