Ring Wrasse

Ring Wrasse

The Ring Wrasse (Hologymnosus annulatus) is a large, elongate and tireless wrasse that changes dramatically with age — juveniles are pale with dark stripes, while adult males become deep green to blue-grey with fine vertical lines. Hardy and striking, it is an impressive fish for a large marine aquarium, but its size, energy and appetite for invertebrates make it a fish for fish-focused systems rather than delicate reefs.

It is a powerful, restless swimmer that needs serious space and robust companions.

Natural Habitat & Origin

Hologymnosus annulatus is widespread across the Indo-Pacific, where it ranges actively over reef flats, slopes and sandy areas, hunting small invertebrates and fish. Like many wrasses it dives into the sand to sleep and to escape danger.

In the aquarium it wants ample open swimming space, live rock with crevices, and a fine sand bed it can bury into.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Reaching up to about 40 cm (16 inches) and extremely active, it needs a large tank of around 450 litres (about 120 US gallons) or more with plenty of swimming room and a sand bed. A secure, gap-free lid is essential — it is an accomplished jumper. It is hardy and adaptable once settled.

Diet & Feeding

The Ring Wrasse is a carnivore, feeding on small invertebrates and fish in the wild. It eagerly accepts aquarium foods: offer a varied meaty diet of frozen mysis and enriched brine shrimp, chopped seafood and quality marine pellets, fed once or twice a day. It is a voracious, reliable feeder.

Behavior & Temperament

This is a semi-aggressive fish that becomes more assertive as it grows large, often dominating tankmates in a smaller system. It is best added later to a community of robust fish, and only one should be kept per tank. Its boundless energy means it is rarely still.

Tank Mates

House it with other robust marine fish — tangs, larger wrasses, angelfish, triggers (with care) and similar — that can hold their own. Avoid small, timid fish that may be harassed or eaten. It is not reef-safe with mobile invertebrates: it will hunt ornamental shrimp, small crabs and other small invertebrates, and its size and energy make it unsuitable for delicate reefs, so it is best in fish-only or fish-with-hardy-coral setups.

Breeding

Hologymnosus annulatus is a protogynous hermaphrodite and pelagic spawner; rearing the larvae is beyond the home aquarium, so trade specimens are wild-collected.

Common Health Issues

The Ring Wrasse is hardy but, like all marine fish, can be affected by marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), particularly when stressed. Quarantine new arrivals, keep water quality stable, provide a sand bed for sleeping, and secure the lid against jumping. Mindful of its size, energy and appetite for invertebrates, it is otherwise a hardy, striking and active fish for a large, robust marine community.