HomeFish encyclopediaRay-finned fishesPerch-like fishCardinalfishesBig red cardinalfish Big red cardinalfish (Apogon unicolor) Scientific name: Apogon unicolor Steindachner & D?derlein, 1883 The Big red cardinalfish (Apogon unicolor) is a marine fish of the family Apogonidae. Native range: Western Pacific, Japan, Taiwan, and Papua New Guinea. BiologyDorsal spines (total): 7; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 8. Body light-yellow and anterior margin of scales dark. Attains 14 cm SL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameApogon unicolorFamilyApogonidae (Cardinalfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length14.0Depth range10–35 m (33–115 ft)EnvironmentMarine; reef-associated; depth range 10 - 35 mClimateTropicalDistributionWestern Pacific: Japan, Taiwan, and 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