
Ostorhinchus fleurieu
Family: Apogonidae ยท Cardinalfish
Also known as: Flower Cardinalfish, Bull's-eye Cardinalfish, Pearly-finned Cardinalfish
The Pearly Cardinalfish is a subtly beautiful species distinguished by its lustrous, pearlescent sheen that catches the light beautifully as it moves through the water column. Its body displays a warm pinkish-silver base coloration with iridescent highlights that shift between pearl white, pale pink, and subtle lavender depending on the lighting angle. A dark spot or bar is often visible near the caudal peduncle, providing a modest accent to its otherwise delicate appearance.
This species is widely distributed across the Indo-Pacific region, from the Red Sea and East African coast through the Indian Ocean to the Western Pacific. It inhabits sheltered reef areas, lagoons, and outer reef slopes where it forms loose aggregations near coral heads and rocky overhangs. In the aquarium, it maintains its preference for congregating with conspecifics and is best kept in small groups.
The Pearly Cardinalfish is a nocturnal feeder in the wild but adapts readily to daytime feeding schedules in captivity. It is hardy, peaceful, and undemanding, making it suitable for aquarists of all experience levels. Its gentle nature and moderate size allow it to thrive in community reef aquariums alongside a wide variety of peaceful tankmates.
Pearly Cardinalfish are carnivores that naturally feed on zooplankton and small crustaceans during nighttime hours. In the aquarium, they quickly adapt to daytime feeding and accept frozen mysis shrimp, enriched brine shrimp, cyclops, and quality marine pellets. Feed two to three times daily in small portions.
The Pearly Cardinalfish is extremely peaceful and compatible with virtually all reef community fish. It does well with clownfish, gobies, blennies, dartfish, and other cardinalfish species. Avoid housing with aggressive or large predatory fish. Groups show minimal intraspecific aggression and school attractively together.
Check CompatibilityPearly Cardinalfish are paternal mouthbrooders. Males incubate fertilized eggs in their mouths for approximately 7-10 days. Pairs form within groups and may breed regularly in well-maintained aquariums. Fry are small and require rotifers or newly hatched brine shrimp as initial foods.