Harlequin Tuskfish

Geographical Origin and Habitat: Western Pacific Ocean. It has a disjunct distribution: found in the Great Barrier Reef of Australia, and from Taiwan to southern Japan. It inhabits seaward reef slopes and outer reef channels at depths ranging from 5 to 35 meters.

Taxonomy and Morphology: A member of the family Labridae, genus Choerodon. It reaches an adult length of up to 30 cm (12 inches). It is characterized by a robust, deep body and large, sharp, protruding blue-green teeth used to crush hard-shelled prey. The tail is truncate.

Social Behavior: Solitary and highly territorial towards conspecifics. Wrasse of high intelligence and curiosity, often observed rearranging small stones and shells in search of prey. Generally peaceful towards unrelated, non-similar sized tankmates.

Coloration and Sexual Dimorphism: Displays striking alternating vertical bands of bright orange-red and blue-grey, outlined in electric neon blue. The teeth are vivid blue. Australian specimens are renowned for having more vibrant coloration. Genders look identical.

Aquarium Setup: Requires a large, established aquarium of at least 500 liters (approx. 130 gallons). Arrange a sturdy live rock formation with large caves. A heavy, tight-fitting lid is absolutely mandatory as this species is a powerful and frequent jumper when startled.

Diet and Feeding: Carnivorous. To prevent its blue teeth from overgrowing, it must be fed hard-shelled foods such as whole clams in shell, unshelled shrimp, krill, crabs, and mussels. High-quality large carnivore pellets are also accepted. Feed once or twice daily.

Water Quality: Maintain stable marine parameters: temperature 24-27°C (75-81°F), pH 8.1-8.4, and specific gravity 1.020-1.025. Strong biological filtration and a high-capacity protein skimmer are essential to handle the heavy organic bioload.

Compatibility and Cohabitation: Semi-aggressive. Not safe with ornamental shrimp, crabs, hermit crabs, or sea urchins, which will be quickly eaten. It is, however, completely safe with corals. Good tankmates include larger tangs, angels, and groupers.

Aquarium Breeding: Captive breeding is not documented in home aquariums due to their territorial nature and space requirements. In the wild, they are broadcast spawners, gathering in large aggregations to release pelagic eggs.

Risks and Diseases: Jump hazard is the most common cause of mortality. Lack of hard-shelled foods causes overgrowth of the blue tusks, which can restrict mouth movement. Generally hardy but susceptible to skin abrasions from unstable rockwork.