HomeFish encyclopediaRay-finned fishesCharacinsCharacinsYucatan tetra Yucatan tetra (Astyanax altior) Scientific name: Astyanax altior Hubbs, 1936 The Yucatan tetra (Astyanax altior) is a freshwater fish of the family Characidae. Native range: North America, Mexico. Species factsScientific nameAstyanax altiorFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; benthopelagicClimateTropicalDistributionNorth America: Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (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