HomeFish encyclopediaRay-finned fishesPerch-like fishCardinalfishesB-spot cardinalfish B-spot cardinalfish (Gymnapogon urospilotus) Scientific name: Gymnapogon urospilotus Lachner, 1953 The B-spot cardinalfish (Gymnapogon urospilotus) is a marine fish of the family Apogonidae. Native range: Pacific Ocean, Taiwan and Ryukyu Islands to the Society Islands; throughout Micronesia. BiologyDorsal spines (total): 7; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 9 - 10. Distinct dark B-shaped spot on caudal fin base.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnapogon urospilotusFamilyApogonidae (Cardinalfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.7Depth range5–12 m (16–39 ft)EnvironmentMarine; reef-associated; depth range 5 - 12 mClimateTropicalDistributionPacific Ocean: Taiwan and Ryukyu Islands to the Society Islands; throughout Micronesia.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