HomeFreshwater aquarium fishRainbowfish & killifishSky-blue killi Sky-blue killi (Aphyosemion coeleste) Scientific name: Aphyosemion coeleste Huber & Radda, 1977 The Sky-blue killi (Aphyosemion coeleste) is a freshwater fish of the family Nothobranchiidae. In the aquarium it needs water at 18–22°C (64–72°F). Native range: Africa, southern Congo and Gabon. Sky-blue killi care at a glanceTemperature18–22°C (64–72°F) BiologyOccurs in swampy parts of rainforest brooks on the inland plains and hills. Not a seasonal killifish. Is difficult to maintain in aquarium.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAphyosemion coelesteFamilyNothobranchiidae (African rivulines)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentFreshwater;; pH range: 5.8 - 7.2 benthopelagic; non-migratoryClimateTropicalDistributionAfrica: southern Congo and Gabon.Conservation status (IUCN)Vulnerable (VU) (B2ab(iii))Threat to humansHarmlessUsesFisheries: of no interest; aquarium: commercial More rainbowfish & killifishTwostripe lyretailAphyosemion bivittatumRed-Tailed SilversideBedotia geayiLyretail panchaxAphyosemion australeCelebes rainbowfishMarosatherina ladigesiCelebes rainbowTelmatherina celebensisMarmorated medakaOryzias marmoratusSee all rainbowfish & killifish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026