Synchiropus stellatus Breeding Guide

The starry (red scooter) dragonet Synchiropus stellatus is an Indian Ocean copepod feeder that, like its relatives, spawns by a dusk pair-ascent releasing pelagic eggs. Home rearing is essentially unreported.

Overview

Synchiropus stellatus, the starry dragonet, is a reef-associated dragonet of the family Callionymidae reaching about 7.5 cm total length. It is distributed in the Indian Ocean from East Africa to Sumatra and around oceanic islands, at depths of 5 to 40 m and usually 10 to 20 m, on coastal protected reefs over rubble and algae-covered rock. Its body is mottled pink or gold above with silvery spots set among dark stellate blotches. As a dragonet it feeds on small benthic invertebrates and is best kept in a copepod-rich mature system.

Sexing

Dragonets are strongly sexually dimorphic, with males larger and bearing longer, more developed fins than females. Display males of this species flare conspicuous fins, which helps distinguish them from the plainer females.

Conditioning

Reproductive condition depends on a steady supply of live copepods. A refugium or mature reef with self-sustaining pod populations is the practical basis for conditioning broodstock; conversion to frozen foods is possible for some individuals but live prey best maintains spawning condition.

Spawning Behavior & Trigger

Dragonet spawning takes place in the late afternoon just before sunset and follows a sequence of courtship display, pairing, ascent and gamete release. Both sexes fan their pectoral and caudal fins, the male also flaring his dorsal fins and nudging the female, after which the pair ascends roughly 0.7 to 1.2 m up the water column before releasing eggs and milt.

Egg & Fry Care

The eggs are buoyant and pelagic and drift with plankton; no parental care follows spawning. In aquaria the eggs must be captured as they rise, and the resulting planktonic larvae need extremely small first foods, so successful rearing has been limited to specialist setups rather than the home aquarium.

Common Challenges

Collecting floating eggs before filtration removes them and feeding the minute larvae are the central obstacles, alongside sustaining the heavy copepod load needed for broodstock and any fry. Documented reproduction therefore rarely extends beyond egg release for this species.