HomeFreshwater aquarium fishGuppies & livebearersDusky splitfin Dusky splitfin (Goodea gracilis) Scientific name: Goodea gracilis Hubbs & Turner, 1939 The Dusky splitfin (Goodea gracilis) is a freshwater fish of the family Goodeidae. In the aquarium it needs water at 21–27°C (70–81°F). Native range: North America, San Luis Potosi (P?nuco River system), Mexico. Dusky splitfin care at a glanceTemperature21–27°C (70–81°F) Species factsScientific nameGoodea gracilisFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length8.0EnvironmentFreshwater;; pH range: 7.0 - 7.7; dH range: ? - 20 demersalClimateTropicalDistributionNorth America: San Luis Potosi (P?nuco River system), Mexico.Conservation status (IUCN)Vulnerable (VU) (A1ace+2ce, B1+2c, C1)Threat to humansHarmlessUsesAquarium: commercial More guppies & livebearersBold characodonCharacodon audaxBluetail goodeaAtaeniobius toweriButterfly splitfinAmeca splendensPoecilia wingeiMollyPoecilia sphenopsSouthern platyfishXiphophorus maculatusSee all guppies & livebearers SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026