Common name: Spiny chromis

General information

The Spiny Chromis, scientifically known as Acanthochromis polyacanthus, is a unique species among damselfish because it lacks the ability to change color, a trait common in its relatives. This fish is recognized for its robust body, spiny dorsal fin, and a coloration that ranges from pale olive to brown with darker bars or spots, which can vary depending on the individual and the environment.

Unlike many other damselfish, the Spiny Chromis is less aggressive and can be a good community fish in a reef aquarium. It is also notable for its parental care, which is rare among marine fishes.

Care

Acanthochromis polyacanthus is a hardy species that adapts well to life in captivity. They require an aquarium with plenty of swimming space and rockwork or coral to provide shelter and territory. A stable environment with consistent water quality is essential for their well-being. They are omnivorous and will accept a variety of foods, including frozen and flake foods, but a diet that includes live or frozen zooplankton can help maintain their health and coloration.

Reproduction

One of the most fascinating aspects of the Spiny Chromis is its reproductive behavior. This species forms monogamous pairs and exhibits biparental care, with both parents guarding and tending to the eggs and fry. The eggs are laid on a substrate, often within the shelter of the reef, and the parents will fiercely defend their offspring until they are ready to fend for themselves.

Habitat

The Spiny Chromis is native to the Western Pacific, particularly around the Great Barrier Reef, Coral Sea, and reefs off northern Australia and Papua New Guinea. They are typically found in shallow, coral-rich areas and lagoons, often in small groups or pairs, and can be observed at depths from just below the surface to about 15 meters.

Geographical distribution includes the Western Pacific: Great Barrier Reef, Coral Sea, northern Australia, and Papua New Guinea.