Harlequin Tuskfish Breeding Guide (Choerodon fasciatus)
Choerodon fasciatus is a pelagic-spawning Labridae wrasse that forms monogamous home-ranging pairs in the wild and is not reared in home aquaria; this guide documents its real reproductive biology and constraints.
Overview
The harlequin tuskfish (Choerodon fasciatus) is a wrasse of the family Labridae, described by Günther in 1867. It reaches about 30 cm in total length and carries roughly eight pairs of alternating orange, blue and white vertical bands with conspicuous blue teeth. The species has a disjunct Western Pacific range, from the Ryukyus and Taiwan and again from New Caledonia to Queensland, Australia, at depths of 5 to 35 m. According to FishBase it is oviparous and forms monogamous, home-ranging pairs.
Sexing
Like most labrids the harlequin tuskfish is difficult to sex by eye, and FishBase records it only as oviparous with distinct pairing during breeding. Australian specimens are noted for brighter coloration, but colour intensity is not a reliable sex marker. No externally diagnostic dimorphism is documented in the consulted sources.
Spawning Behavior & Trigger
FishBase reports that the species is monogamous and always found in home-ranging pairs, with distinct pairing during the breeding season. As an oviparous reef wrasse it is a pelagic (broadcast) spawner: paired fish release eggs and milt into the water column, after which fertilised eggs drift as plankton. No specific captive spawning trigger has been documented.
Egg & Fry Care
The fertilised eggs are pelagic and develop into planktonic larvae that disperse in open water. This larval phase is the principal barrier to captive rearing, since the larvae are minute and require live planktonic food at densities not practical in a home tank. No published home-aquarium fry-rearing data exist for this species.
Common Challenges
Beyond the pelagic-larvae barrier, the species is intra-specifically aggressive: adults cannot be kept with their own kind, which makes establishing a compatible pair in captivity impractical. It is also not reef-safe, preying on crustaceans, molluscs and worms, so a dedicated spawning system would conflict with typical reef setups. For these reasons it remains a wild-caught species in the aquarium trade.