Common name: Chubby cardinalfish

General information

Cook's Cardinalfish, scientifically known as Ostorhinchus cookii, is a small and peaceful marine fish that is well-suited for community aquariums. They are nocturnal by nature and exhibit a silver body with striking orange to red stripes and spots, which can add a pop of color to any tank.

These cardinalfish are relatively hardy and can be a good choice for both novice and experienced aquarists. They are often found in schools in the wild and can display schooling behavior in the aquarium as well, especially when kept in groups.

Care

Ostorhinchus cookii prefers a well-established aquarium with plenty of hiding places among live rock and coral. They thrive in a stable environment with consistent water quality. A varied diet of small meaty foods such as mysis shrimp, brine shrimp, and finely chopped seafood will help maintain their health and coloration.

Reproduction

Cook's Cardinalfish are mouthbrooders, with the male carrying the eggs in his mouth until they hatch. This fascinating reproductive behavior can sometimes be observed in the home aquarium. The male will not eat during this brooding period, which can last for several weeks.

Habitat

Native to the Western Pacific, Cook's Cardinalfish are typically found in coral reefs and lagoons at depths ranging from shallow waters to about 30 meters. They prefer areas with moderate to low current and are often associated with branching corals and overhangs that provide shelter during the day.