HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesPupfishesCottonball Marsh pupfish Cottonball Marsh pupfish (Cyprinodon salinus milleri) Scientific name: Cyprinodon salinus milleri LaBounty & Deacon, 1972 The Cottonball Marsh pupfish (Cyprinodon salinus milleri) is a freshwater fish of the family Cyprinodontidae. Native range: North America, Cottonball Marsh, adjacent to Salt Creek in Death Valley, California, USA. BiologyNot a seasonal killifish. Is very difficult to maintain in aquarium.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCyprinodon salinus milleriFamilyCyprinodontidae (Pupfishes)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length4.5EnvironmentFreshwater; benthopelagic; non-migratoryClimateSubtropicalDistributionNorth America: Cottonball Marsh, adjacent to Salt Creek in Death Valley, California, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, 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