Common name: Narrowstripe cardinalfish

General information

The Blackaxil Cardinalfish, scientifically known as Pristiapogon exostigma, is a small and peaceful marine fish that is well-suited for the home aquarium. Its distinctive feature is the black spot located at the base of the tail, which gives it the name 'twospot'. This species is part of the Apogonidae family, which is known for its hardiness and ease of care, making it a popular choice among both novice and experienced aquarists.

Care

Blackaxil Cardinalfish are relatively easy to care for. They thrive in a well-established aquarium with stable water conditions and plenty of hiding spaces. These fish are nocturnal and prefer dimly lit environments. They are not aggressive and can be kept with other peaceful fish. 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

Like many cardinalfish, Pristiapogon exostigma is a mouthbrooder. The male will carry the fertilized eggs in his mouth until they hatch, which provides protection from predators. This fascinating reproductive behavior can sometimes be observed in the home aquarium, offering a unique spectacle for the aquarist.

Habitat

The Blackaxil Cardinalfish is found in the Indo-Pacific region, from the Red Sea and East Africa to Samoa, north to the Ryukyu Islands, and south to New Caledonia. They typically inhabit coral reefs and lagoons, often hiding among the branches of corals or in crevices during the day.