HomeFish encyclopediaRay-finned fishesCatfishSea catfishesLacandon sea catfish Lacandon sea catfish (Potamarius nelsoni) Scientific name: Potamarius nelsoni Evermann & Goldsborough, 1902 The Lacandon sea catfish (Potamarius nelsoni) is a freshwater fish of the family Ariidae. Native range: Central America, Usumacinta River basin in Mexico. Species factsScientific namePotamarius nelsoniFamilyAriidae (Sea catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length39.0EnvironmentFreshwater; demersalClimateTropicalDistributionCentral America: Usumacinta River basin in Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansTraumatogenicResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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