HomeFreshwater aquarium fishRainbowfish & killifishHerzog's killi Herzog's killi (Aphyosemion herzogi) Scientific name: Aphyosemion herzogi Radda, 1975 The Herzog's killi (Aphyosemion herzogi) is a freshwater fish of the family Nothobranchiidae. In the aquarium it needs water at 18–22°C (64–72°F). Native range: Africa, northern Gabon, Equatorial Guinea, Cameroon. Herzog's killi care at a glanceTemperature18–22°C (64–72°F) BiologyOccurs in clear and flowing brooks in the mountainous rainforest of the inland plain. Not a seasonal killifish. Bottom spawner, 1 month incubation.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAphyosemion herzogiFamilyNothobranchiidae (African rivulines)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length5.0EnvironmentFreshwater;; pH range: 6.5 - 7.2 benthopelagic; non-migratoryClimateTropicalDistributionAfrica: northern Gabon, Equatorial Guinea, Cameroon.Conservation status (IUCN)Least Concern (LC)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