HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPoeciliidsSulphur molly Sulphur molly (Poecilia sulphuraria) Scientific name: Poecilia sulphuraria ?lvarez, 1948 The Sulphur molly (Poecilia sulphuraria) is a freshwater fish of the family Poeciliidae. In the aquarium it needs water at 24–28°C (75–82°F). Native range: Central America, Grijalva system in Mexico. Sulphur molly care at a glanceTemperature24–28°C (75–82°F) Species factsScientific namePoecilia sulphurariaFamilyPoeciliidae (Poeciliids)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentFreshwater; benthopelagic; non-migratoryClimateTropicalDistributionCentral America: Grijalva system in Mexico.Conservation status (IUCN)Critically Endangered (CR) (A1ac+2ce, B1+2ac, C2b)Threat 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