HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsPeten molly Peten molly (Poecilia petenensis) Scientific name: Poecilia petenensis G?nther, 1866 The Peten molly (Poecilia petenensis) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 22–28°C (72–82°F). Native range: Central America, southeastern Mexico to Belize and Guatemala. Peten molly care at a glanceTemperature22–28°C (72–82°F) Species factsScientific namePoecilia petenensisFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length8.0EnvironmentFreshwater; benthopelagic; non-migratoryClimateTropicalDistributionCentral America: southeastern Mexico to Belize and Guatemala.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceMedium, 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