Common name: Yelloweye Cardinalfish

General information

The One-spot Cardinalfish, Ostorhinchus monospilus, is a peaceful and nocturnal species that is well-suited for community aquariums. Its distinguishing feature is the singular large black spot located on the body near the base of the tail, which can be used to identify it from other cardinalfish. This species is relatively small, reaching up to 3 inches in length, and has a silver body with a yellowish hue on the fins.

Care

Ostorhinchus monospilus is an undemanding fish that adapts well to life in captivity. It prefers a well-decorated aquarium with plenty of hiding spaces among rocks or soft corals. These fish are best kept in small groups or pairs, as they are social creatures that appreciate the company of their own kind. They thrive on a varied diet of meaty foods such as mysis shrimp, brine shrimp, and finely chopped seafood.

Reproduction

In the wild, One-spot Cardinalfish are mouthbrooders, with males carrying the eggs in their mouths until they hatch. This fascinating reproductive behavior can also be observed in the home aquarium, making them an interesting species for aquarists interested in breeding marine fish.

Habitat

Native to the Indo-Pacific region, Ostorhinchus monospilus is typically found in shallow coastal waters, often around coral reefs and lagoons. They tend to stay close to the bottom, where they can easily find shelter among the corals and substrate.