HomeFish encyclopediaRay-finned fishesPerch-like fishCardinalfishesSea urchin cardinalfish Sea urchin cardinalfish (Siphamia versicolor) Scientific name: Siphamia versicolor Smith & Radcliffe, 1911 The Sea urchin cardinalfish (Siphamia versicolor) is a marine fish of the family Apogonidae. BiologyDorsal spines (total): 8; Dorsal soft rays (total): 8-9; Anal spines: 2; Anal soft rays: 8 - 9Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSiphamia versicolorFamilyApogonidae (Cardinalfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length7.0Common length4.0Depth range0–68 m (0–223 ft)EnvironmentMarine; reef-associated; depth range 0 - 68 mClimateTropicalDistributionIndo-West Pacific: Maldives to Mariana Islands, north to Ryukyu Islands, south to northwestern Australia; Mariana and eastern Caroline Islands in Micronesia. Recently reported from Tonga.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