Purple-spotted wrasse

Geographical Origin and Habitat: Halichoeres purpurescens is native to the warm tropical waters of the Western Indo-Pacific, with populations commonly recorded along the coral reefs of Indonesia, the Philippines, and Papua New Guinea. It inhabits sheltered coastal lagoons, tidal flats, and outer reefs at depths between 2 and 20 meters, mainly frequenting sandy areas mixed with coral rubble and seagrass.

Taxonomy and Morphology: It belongs to the family Labridae, genus Halichoeres. It has a fusiform, slender body slightly compressed laterally, with a conical head equipped with small eyes and a terminal mouth armed with small sharp canines to capture benthic prey. The caudal fin is rounded or truncate in adults. The species reaches a maximum length of about 12-14 centimeters.

Social Behavior: It is an active and tireless species that constantly patrols the bottom and rocks searching for food during the day. It has a peaceful temperament and coexists well with most other species. It shows intraspecific territoriality, especially among adult males. As a protective behavior typical of the genus, it buries itself completely in the sand every evening to sleep or in case of danger.

Coloration and Sexual Dimorphism: The coloration of adults is complex: the body has greenish-olive or brown hues, embellished with purplish or pinkish reflections on the edges of the scales. Intricate pink-orange lines or bands bordered by blue shading are present on the head and fins. Adult males have much more saturated colors than females and juveniles, which show a lighter coloration.

Aquarium Setup: Requires an aquarium of at least 150-200 liters. It is of fundamental importance that the bottom of the aquarium is covered with a layer of at least 5-8 centimeters of fine and non-sharp sand (fine aragonite), indispensable to allow the fish to bury itself for the night. The decor must include live rock arranged to create open passages and shaded areas, leaving plenty of room for swimming.

Diet and Feeding: It is a carnivorous species with an active metabolism. In the wild, it feeds on small crustaceans, mollusks, polychaete worms, and other benthic invertebrates. In the aquarium, it must be fed two or three times a day with a varied diet based on frozen food such as mysis, brine shrimp, chopped krill, and shellfish meat. It also quickly accepts high-quality dry food in granules or flakes.

Water Quality: Water parameters must be maintained within the ideal range for marine aquariums: temperature between 24 and 27 °C, pH between 8.1 and 8.4, specific gravity between 1.020 and 1.025, and KH between 8 and 12. Filtration must be efficient to keep nitrogenous compounds as low as possible. Regular water changes and good movement promote the health of the fish.

Compatibility and Cohabitation: It is an excellent community aquarium fish, compatible with tangs, clownfish, gobies, and anthias. It is safe for corals, but is not completely reef safe towards small ornamental invertebrates: adult specimens may prey on small shrimps (such as cleaner shrimps), small hermit crabs, and small benthic snails, as well as tubeworms.

Aquarium Breeding: Breeding in captivity has not been documented to date in private aquariums. They are pelagic spawners: in the wild, they reproduce by releasing eggs and sperm into the open sea. The eggs float and follow ocean currents, giving rise to planktonic larvae that undergo a complex metamorphosis before settling on the bottom. Rearing the larvae requires specific infrastructures.

Risks and Diseases: The main risk in the aquarium is jumping out of the tank: the use of a lid or a protective net is mandatory. The absence of adequate sand causes severe stress and physical injuries to the snout when attempting to bury itself, exposing it to opportunistic bacterial infections. Otherwise, it is a robust fish that responds well to antiparasitic treatments if necessary.