Common name: Black-bar chromis

General information

The Black-axil Chromis, Chromis retrofasciata, is a small and peaceful marine fish that is well-suited for community reef aquariums. It is characterized by its striking black spot on the upper base of the pectoral fins, which contrasts with its pale blue to greenish body coloration. This species is often appreciated for its schooling behavior and can add a dynamic element to the aquarium as it swims in unison with its conspecifics.

Care

Black-axil Chromis are relatively hardy and can adapt to a range of aquarium conditions, making them suitable for both novice and experienced aquarists. They thrive in well-established aquariums with stable water quality and plenty of swimming space. These fish are omnivorous and will accept a variety of foods, including small pellet and flake foods, as well as frozen and live meaty foods like mysis shrimp and brine shrimp.

Reproduction

In the wild, Black-axil Chromis are known to spawn in groups, with females releasing eggs into the water column to be fertilized by males. In the home aquarium, breeding is less common, but with optimal conditions and a mature group, spawning may occur. The larvae are planktonic and would require specialized care to raise in captivity.

Habitat

Chromis retrofasciata is found in the Indo-Pacific region, typically inhabiting coral reefs and lagoons. They prefer areas with strong water movement and are often observed in the wild at depths ranging from shallow waters to about 12 meters. Their natural habitat includes reef slopes and edges where they can be seen darting among stony and soft corals.