Bandit Wrasse Breeding Guide (Polylepion russelli)
Polylepion russelli is a deep-water North Pacific wrasse recorded only as an oviparous pair-spawner; it is not bred in aquaria, and this guide outlines its real reproductive biology and the obstacles to captive breeding.
Overview
The bandit wrasse (Polylepion russelli) is a Labridae wrasse of the subfamily Hypsigenyinae, distributed in the North Pacific around Japan and the Hawaiian Islands. It reaches about 25 cm in total length and is a deep-water, benthopelagic species recorded by FishBase at depths of 100 to 353 m, with a temperature preference centred near 20 degrees Celsius. It carries a pale body with a bold dark band across the eyes.
Sexing
FishBase records the species only as oviparous with distinct pairing during breeding and provides no externally diagnostic dimorphism. Many wrasses are protogynous with sex-linked colour phases, but the consulted source does not document a confirmed sexing key for this species, so reliable visual sexing is not established.
Spawning Behavior & Trigger
According to FishBase the species spawns in distinct pairs during the breeding season. As an oviparous, benthopelagic reef wrasse it is a pelagic broadcast spawner, releasing buoyant eggs into the water column that then disperse. No captive spawning trigger is documented, and its deep, cool habitat is difficult to replicate.
Egg & Fry Care
The eggs are pelagic and hatch into planktonic larvae that drift in open water. As with other broadcast-spawning wrasses, this dispersal-larvae strategy is the core barrier to captive rearing; there is no published home-aquarium fry-rearing protocol for the species.
Common Challenges
The deep-water origin (down to 353 m) and cool thermal preference make conditioning adults for spawning impractical in standard tropical systems, and the species rarely enters the trade. Combined with the unreared pelagic larval phase, these factors mean captive breeding has not been achieved.