Mirolabrichthys dispar Breeding Guide

The peach fairy anthias is a protogynous, harem-living planktivore that broadcast-spawns pelagic eggs over the reef. Its planktonic larvae make home breeding impractical.

Overview

Mirolabrichthys dispar, the peach fairy anthias, is recorded on FishBase under the genus name Nemanthias (formerly Pseudanthias dispar), reflecting a 2022 revision in which Mirolabrichthys is a related taxon. It ranges across the Pacific from Christmas Island to the Line Islands at depths of about 0 to 18 metres, reaches around 9.5 cm and occurs in large mixed-sex aggregations feeding in reef currents; it is replaced by Pseudanthias ignitus in the Indian Ocean.

Sexing

The peach fairy anthias is protogynous: fish begin as females and the dominant female changes into a male when the resident male is lost. Groups are harems of one dominant male with two to twelve females and up to two subdominant males. The species is sexually dimorphic: females are orange with a yellowish tail and a pink line, while males display a bright red dorsal fin.

Spawning Behavior & Trigger

The dominant male courts harem females with acrobatic U-swim displays before paired ascents into the water column release gametes. Aquaculture observations on related anthias place spawning near dusk, with buoyant eggs floating at the surface that are recovered using an evening egg collector rather than from a nest.

Egg & Fry Care

Eggs are pelagic and hatch into tiny planktonic larvae that feed within the plankton. In documented related-anthias rearing, larvae took copepods and settled into juveniles roughly a month after hatching. These conditions cannot be recreated in a home reef, where the floating egg stage and live-plankton larval diet are unmanageable.

Common Challenges

Anthias have been aquacultured for only a few species in institutional hatcheries. Wild-caught individuals additionally require frequent feeding plus expert quarantine and conditioning to survive, so home breeding of the peach fairy anthias is not realistic.