Argus Wrasse Care Guide
Halichoeres argus is a small Indo-Pacific reef wrasse with an eye-spotted ('argus') pattern, a carnivorous, sand-diving species kept in marine aquaria.
Compiled by Aquairi from published sources · Published · Updated
Overview
Halichoeres argus, the argus wrasse, is a small marine wrasse of the Indo-West Pacific. It has an olive body marked with an eye-spotted pattern that gives rise to the name argus. It is a diurnal, sand-associated reef fish.
Taxonomy
- Family: Labridae
- Subfamily: Julidinae
- Genus: Halichoeres
- Scientific name: Halichoeres argus
Habitat
According to FishBase the species ranges across the Indo-West Pacific from Sri Lanka to Fiji and Tonga, north to Taiwan and south to northern Australia. It is a reef-associated marine fish recorded at depths of about 1-15 m, occurring on shallow coastal reefs, seagrass flats, and algae-rocky reef flats and lagoons.
Tank requirements
- Minimum tank volume: 250 L (66 gal)
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- Carbonate hardness: 8-12 °dKH
- Substrate: sand bed (wrasses bury at night)
- Lifespan: 5-10 years
Diet
A carnivore; FishBase lists a trophic level of about 3.4. In the aquarium it takes meaty marine foods. Wrasses of this genus hunt small invertebrates over and within the substrate.
Compatibility
A peaceful, bottom-oriented wrasse that is considered reef-safe and is often kept to help control pest invertebrates. It is gregarious and typically found in groups in the wild; very aggressive damsels and predatory fish make poor tankmates.
Conservation status
IUCN Red List: Least Concern (assessed 2009).
Halichoeres argus (Argus Wrasse): Breeding Guide
Overview
Halichoeres argus is a small Labridae wrasse of the Indo-West Pacific, from Sri Lanka to Fiji and Tonga, north to Taiwan and south to northern Australia. FishBase records a maximum length of 12 cm and a depth range of 1 to 15 m, on shallow coastal reefs, algae-rocky reef flats, lagoons and seagrass flats.
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 reports the species is usually found in groups. 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. With no parental care, 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.