HomeFreshwater aquarium fishRainbowfish & killifishGreen panchax Green panchax (Aplocheilus blockii) Scientific name: Aplocheilus blockii Arnold, 1911 The Green panchax (Aplocheilus blockii) is a freshwater fish of the family Aplocheilidae. In the aquarium it needs water at 22–26°C (72–79°F). Native range: Asia, India, Pakistan and Sri Lanka. Green panchax care at a glanceTemperature22–26°C (72–79°F) BiologyInhabits stationary and sheltered waters of rivers. Found under the surface in still waters, mainly coastal and often brackish, especially where there is surface vegetation or cover, such as mangrove swamps and rice fields. Swims slowly or stays stationary, often in small groups. Feeds on insects, larvae and fish fry. Valuable for mosquito control. Not a seasonal killifish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAplocheilus blockiiFamilyAplocheilidae (Killifishes)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length6.0EnvironmentFreshwater; brackish; benthopelagic; non-migratoryClimateTropicalDistributionAsia: India, Pakistan and Sri Lanka.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest; aquarium: commercial More rainbowfish & killifishArgentine pearlfishAustrolebias bellottiiRedtail nothoNothobranchius guentheriStriped panchaxAplocheilus lineatusMarmorated medakaOryzias marmoratusCelebes rainbowTelmatherina celebensisCelebes rainbowfishMarosatherina ladigesiSee 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