HomeFish encyclopediaRay-finned fishesSilversidesRainbowfishes, blue eyesBlue rainbowfish Blue rainbowfish (Melanotaenia caerulea) Scientific name: Melanotaenia caerulea Allen, 1996 The Blue rainbowfish (Melanotaenia caerulea) is a freshwater fish of the family Melanotaeniidae. Native range: Oceania, Papua New Guinea. Species factsScientific nameMelanotaenia caeruleaFamilyMelanotaeniidae (Rainbowfishes, blue eyes)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length6.2EnvironmentFreshwater; benthopelagicClimateTropicalDistributionOceania: Papua New Guinea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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