Comb Wrasse

Geographical Origin and Habitat: This species is native to the temperate and subtropical waters of the southwestern Pacific Ocean, primarily recorded along the eastern coast of Australia (from southern Queensland down to New South Wales) and around New Zealand. It inhabits the margins of rocky and coral reefs, frequently roaming over sandy areas at depths of 3 to 30 meters.

Taxonomy and Morphology: Coris picta belongs to the Labridae family and the genus Coris. It features an elongated, slender, and laterally compressed body profile that is highly hydro-dynamic. The mouth is small with sharp teeth adapted for preying on small benthic organisms. Adult specimens can reach a maximum standard length of approximately 25 cm.

Social Behavior: An active, diurnal swimmer that is constantly on the move during daylight hours. Juvenile comb wrasses function as cleaner fish, picking parasites and dead tissue off larger fish. Adults are solitary or form loose groups, and they spend significant time turning over rubble and blowing water into the sand to uncover prey.

Coloration and Sexual Dimorphism: The species has a white body with a broad, black longitudinal stripe along the upper half, which features a comb-like, zig-zag lower border. The belly is white. Terminal phase males develop vibrant yellow coloration on the head and tail, along with purple accents on the fins.

Aquarium Setup: Requires a very large and spacious tank of at least 400 liters (100 gallons) to accommodate its active swimming behavior. It is critically important to provide a soft, fine sand bed (not crushed coral) at least 6-8 cm deep, as this wrasse burrows completely into the substrate to sleep at night or when threatened. A secure screen lid is mandatory to prevent jumping.

Diet and Feeding: Carnivorous. Naturally feeds on small crabs, shrimps, snails, and polychaete worms. In the aquarium, it readily accepts a varied diet of frozen foods such as mysis shrimp, krill, brine shrimp, and chopped seafood. High-quality marine pellets and flakes are usually accepted once the fish is acclimated.

Water Quality: Being a subtropical species, it prefers cooler temperatures than typical tropical reef fish, with a range between 16°C and 22°C. Maintain standard marine parameters: pH 8.1-8.4, specific gravity of 1.020-1.025, and KH 8-12. Strong mechanical filtration and high dissolved oxygen levels are required.

Compatibility and Cohabitation: Generally peaceful towards other fish of similar size. It is reef-safe with corals but is not compatible with small invertebrates. It will actively hunt and consume ornamental shrimps, small crabs, and snails. Juveniles are peaceful and will clean other tankmates.

Aquarium Breeding: It is a protogynous hermaphrodite, starting life as female and transitioning to male. Breeding in home aquariums is extremely rare and has not been successfully achieved on a commercial scale due to the pelagic nature of their eggs and larvae, which require specialized planktonic food.

Risks and Diseases: The primary risk is skin and mouth damage from coarse, sharp substrates or a lack of sand, leading to secondary bacterial infections. Stress-induced diseases can occur if they are kept at constant tropical temperatures above 25°C for extended periods.