Radiant Wrasse Care Guide
Halichoeres iridis is a small reef wrasse from the western Indian Ocean, reaching about 11.5 cm and living over sand and rubble on seaward reefs.
Compiled by Aquairi from published sources · Published · Updated
Overview
Halichoeres iridis is a small marine wrasse of the family Labridae, described by Randall and Smith in 1982. It reaches about 11.5 cm in total length. The body is brownish with an orange-yellow head bearing greenish bands and a dark spot behind the eye; females show a red band along the back. It is collected for the aquarium trade and also taken in commercial fisheries.
Taxonomy
- Family: Labridae
- Genus: Halichoeres
- Scientific name: Halichoeres iridis
- Authority: Randall & Smith, 1982
Habitat
The species occurs in the western Indian Ocean along the East African coast south to Natal in South Africa, and around Madagascar, the Seychelles and the Chagos Archipelago. It is a reef-associated fish of steep seaward reefs, where it lives over areas of sand and rubble. FishBase records a depth range of 6 to 43 m.
Tank requirements
- Minimum tank volume: 200 L
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- GH/dKH: reef hardness (about 8-12 °dH)
- Substrate: sand layer for burrowing
- Lifespan: 5-10 years
Diet
Halichoeres iridis is a carnivore. FishBase places it at a trophic level of about 3.4. As a sand- and rubble-foraging wrasse it takes small benthic invertebrates; in the aquarium it should be offered a varied meaty diet fed several times a day.
Compatibility
It is a peaceful, bottom-oriented species and is regarded as reef-safe. It suits a community of similarly non-aggressive reef fishes such as tangs, clownfishes, cardinalfishes and anthias, and should be kept away from very aggressive damselfishes and predatory species. A deep sand bed lets it bury itself, which is normal sleeping and escape behaviour for the genus.
Conservation status
IUCN Red List: Least Concern (assessed 2009).
Halichoeres iridis (Radiant Wrasse): Breeding Guide
Overview
Halichoeres iridis is a small Labridae wrasse of the western Indian Ocean, from the East African coast south to Natal and around Madagascar, the Seychelles and the Chagos Archipelago. FishBase records a maximum length of 11.5 cm and a depth range of 6 to 43 m, on steep seaward reefs in sand and rubble areas.
Sexing
Halichoeres wrasses are protogynous hermaphrodites: individuals mature as initial-phase (IP) females, and appropriate social cues induce sex change to a terminal-phase (TP) male (PMC study on the congener H. trimaculatus). Functional sex therefore follows social context rather than fixed colour alone.
Spawning Behavior & Trigger
FishBase notes distinct pairing during breeding. Halichoeres are pelagic broadcast spawners: a terminal-phase male and a female rise off the bottom and release eggs and milt into open water, where the eggs drift as plankton. Social structure ranges from strict harems at low density to loose systems at high density.
Egg & Fry Care
The broadcast eggs are buoyant and develop in the plankton, producing tiny larvae with a long pelagic phase before settlement. This larval ecology, combined with the absence of parental care, means rearing requires hatchery-scale live-feed culture rather than home tanks.
Common Challenges
Halichoeres wrasses require a deep sand bed to bury into at night or when threatened, so any breeding system must replicate this. The combination of sand-diving needs, social sex change and a long pelagic larval stage places reproduction beyond home aquariums.