Common name: Threadfin Cardinalfish

General information

The Threadfin Cardinalfish, scientifically known as Apogonichthyoides cathetogramma, is a small and peaceful marine fish that is well-suited for community aquariums. This species is recognized by its distinctive long thread-like first dorsal fin and a body coloration that ranges from pale to a more intense pinkish hue, often with darker vertical bands.

Care

Threadfin Cardinalfish are relatively easy to care for, making them suitable for both novice and experienced aquarists. They thrive in a well-established aquarium with plenty of hiding spaces and a peaceful environment. They are nocturnal by nature and prefer dimly lit tanks. 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, Apogonichthyoides cathetogramma are mouthbrooders. The male carries the eggs in his mouth until they hatch, providing protection from predators. This fascinating reproductive behavior can sometimes be observed in the home aquarium, offering a unique spectacle for the aquarist.

Habitat

Threadfin Cardinalfish are found in the Indo-West Pacific region, from the Maldives to Papua New Guinea, and as far north as the Ryukyu Islands. They typically inhabit coral reefs and lagoons, often sheltering in caves or overhangs during the day. In the wild, they are usually found at depths ranging from 1 to 25 meters.