Neon Damsel (Pomacentrus coelestis) Breeding Guide

Pomacentrus coelestis is an oviparous damselfish that deposits demersal eggs on the substrate, with males guarding and aerating the nest. Its pelagic larvae make home rearing difficult.

Overview

Pomacentrus coelestis Jordan & Starks, 1901, the neon damselfish, ranges widely across the Eastern Indian Ocean and Western Central Pacific, from Sri Lanka to the Line and Tuamotu Islands, and grows to about 9 cm total length. FishBase records it as oviparous with distinct pairing during breeding, following the family's demersal-spawning, male-guarded pattern.

Sexing

No reliable sexing method is documented for P. coelestis in the consulted sources, and the species shows little external dimorphism. As in related damselfishes, the nest-tending male is identified behaviourally during reproduction rather than by colour or finnage.

Conditioning

A species-specific conditioning regimen is not documented. P. coelestis is planktivorous, feeding on zooplankton and benthic algae (trophic level about 3.2); a varied diet rich in marine zooplankton substitutes supports condition. Maintain stable reef parameters within the species' recorded ranges (temperature about 24–26 °C, pH 8.1–8.4). The species is notably hardy.

Breeding Setup

Adults inhabit lagoon and seaward reefs close to the bottom among rubble beds, so a system with open rock or rubble offers a male a defensible nesting surface. The family pattern has the male clear an area of algae and invertebrates to form the nest. Because the species is aggressive, generous space and broken sightlines reduce conflict.

Spawning Behavior & Trigger

Specific spawning triggers for P. coelestis are not documented. Across Pomacentridae, ritualised courtship precedes spawning, after which the female lays a string of sticky eggs attached to the substrate and the male fertilises them externally. FishBase confirms the eggs are demersal and adhere to the substrate and that males guard and aerate them.

Egg & Fry Care

The male tends the clutch, guarding and aerating it through incubation. At family level, eggs hatch over about two to seven days into transparent larvae roughly 2–4 mm long that enter a pelagic phase. This planktonic stage is the principal obstacle to home reproduction.