Apogon capricornis Allen & Randall, 1993 [1] Ostorhinchus capricornis, also known as the Capricorn cardinalfish, is a species of ray-finned fish, a cardinalfish from the family Apogonidae which occurs around reefs in the western Pacific Ocean.

[2] Ostorhinchus capricornis is named after the Capricorn Group of islands in southern Great Barrier Reef, Queensland, where most of the specimens have been collected.

[2] Ostorhinchus capricornis is associated with reefs at depths of 2–15 metres (6.6–49.2 ft) and they normally spend the day sheltering in caves and crevices.

[3] Small groups emerge from their daytime shelters at dusk and they feed on benthic invertebrates and zooplankton.

[2] They form pairs which demonstrate courtship behaviours before spawning and the male then broods the eggs in his mouth.