The Black Mimic Tang (Acanthurus chronixis), also known as the Half-Black Mimic Tang, is a species of marine ray-finned fish belonging to the family Acanthuridae. As a juvenile, it mimics the appearance of certain angelfish species as a form of protective camouflage. This mimicry behavior gives it its common name.

Physical Description

The Black Mimic Tang has an oval-shaped, laterally compressed body. Juveniles display a dark coloration on the posterior half of the body with lighter coloration anteriorly, mimicking dwarf angelfish. As they mature, the coloration changes to a more uniform dark brown to black. The dorsal fin has 9 spines and 24-27 soft rays while the anal fin has 3 spines and 22-24 soft rays. This species reaches a maximum total length of approximately 15 cm (5.9 in).

Distribution and Habitat

The Black Mimic Tang is found in the Western Pacific Ocean, particularly around the Philippines and Indonesia. It inhabits shallow coral reefs and lagoons.

Diet and Feeding

The Black Mimic Tang is primarily herbivorous, feeding on filamentous algae in the wild. In captivity, it should be offered a varied diet including marine algae, spirulina, and high-quality vegetable-based preparations.

Aquarium Care

The Black Mimic Tang is generally peaceful and can be kept in a reef aquarium. It requires a tank of at least 70 gallons with abundant live rock for grazing. It is less aggressive than many other tang species and can be kept with a variety of tankmates.

Conservation Status

Classified as Least Concern by the IUCN Red List.