HomeFish encyclopediaRay-finned fishesPerch-like fishCardinalfishesFlagfin cardinalfish Flagfin cardinalfish (Apogon truncatus) Scientific name: Apogon truncatus Bleeker, 1854 The Flagfin cardinalfish (Apogon truncatus) is a marine fish of the family Apogonidae. Native range: Indo-Pacific, Red Sea and the Persian Gulf to Japan and Australia. BiologyNocturnal species which occurs in inshore waters of the continental shelfSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameApogon truncatusFamilyApogonidae (Cardinalfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Depth range0–132 m (0–433 ft)EnvironmentMarine; reef-associated; depth range 0 - 132 mClimateTropicalDistributionIndo-Pacific: Red Sea and the Persian Gulf to Japan and Australia.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