HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPupfishesThicklip pupfish Thicklip pupfish (Cyprinodon labiosus) Scientific name: Cyprinodon labiosus Humphries & Miller, 1981 The Thicklip pupfish (Cyprinodon labiosus) is a freshwater fish of the family Cyprinodontidae. In the aquarium it needs water at 22–26°C (72–79°F). Native range: Central America, Yucat?n-Quintana Roo system. Thicklip pupfish care at a glanceTemperature22–26°C (72–79°F) Species factsScientific nameCyprinodon labiosusFamilyCyprinodontidae (Pupfishes)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length7.0EnvironmentFreshwater; benthopelagic; non-migratoryClimateTropicalDistributionCentral America: Yucat?n-Quintana Roo system.Conservation status (IUCN)Critically Endangered (CR) (B1ab(v))Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tm SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026