Barred Thicklip Wrasse - Hemigymnus fasciatus

Barred Thicklip Wrasse (Hemigymnus fasciatus)

The Barred Thicklip Wrasse (Hemigymnus fasciatus) is a distinctive Indo-Pacific marine wrasse recognised by its thick lips, bold pale body bands and colourful blue, pink, yellow and green facial markings. Also known as the Fiveband Wrasse or Banded Thicklip, it changes dramatically as it matures, with dark, secretive juveniles developing into powerful and highly active adults. Its unusual sand-sifting feeding behaviour makes it fascinating to observe, but its substantial adult size and appetite for crustaceans, molluscs and echinoderms make it best suited to a large fish-only or carefully planned marine aquarium.

Common Name:
Barred Thicklip Wrasse, Barred Thicklip, Fiveband Wrasse, Five-Banded Wrasse, Banded Thicklip, Barred Wrasse

Scientific Name (Latin):
Hemigymnus fasciatus

Maximum Size:
Up to approximately 30 cm in total length. Juveniles are often offered at a much smaller size but develop into deep-bodied, powerful adults requiring generous permanent accommodation.

Water Type:
Marine

Origin / Natural Habitat:
Widely distributed throughout the tropical Indo-Pacific, excluding the Red Sea, from East Africa across the Indian Ocean and Southeast Asia to northern Australia and numerous western and central Pacific islands.

It inhabits sheltered coral reefs, reef flats and areas containing sand or mixed sand-and-rubble substrate, generally from shallow water to depths of approximately 30 metres. Adults are commonly encountered alone or in small groups, while juveniles remain close to shelter and may associate with long-spined sea urchins.

Water Parameters:
Temperature: 24–28°C
pH Range: 8.1–8.4
Salinity: 1.020–1.025 SG

Temperament:
Semi-aggressive and increasingly assertive as it matures. Juveniles may initially appear peaceful, but adults can intimidate smaller, timid or slow-feeding fish and may become territorial towards other large wrasses.

It should be maintained with robust marine fish of a suitable size. Avoid very small fish, delicate bottom dwellers and similarly shaped wrasses unless the aquarium is exceptionally spacious.

Diet:
A carnivorous bottom feeder that naturally consumes shrimps, crabs, snails, bivalves, brittle stars, sea urchins and other benthic invertebrates.

The Barred Thicklip Wrasse frequently takes mouthfuls of sand and rubble, separates edible prey within its mouth and throat, and releases the remaining substrate through its gill openings.

In the aquarium, offer a varied diet of chopped prawn, mussel, clam, cockle, squid, krill, mysis shrimp and other marine-origin foods. Hard-shelled marine foods provide useful enrichment and encourage natural feeding behaviour. Feed at least twice daily, with growing juveniles benefiting from several smaller meals.

Minimum Tank Size:
A minimum aquarium volume of approximately 750 litres is recommended for long-term care, with a tank length of at least 180 cm preferred.

A larger aquarium is advisable when keeping the fish with other substantial wrasses or active territorial species. A wide footprint with extensive open substrate is particularly important.

Behaviour & Activity:
An active daytime fish that spends much of its time swimming close to the substrate and searching sand, rubble and rockwork for hidden prey.

Adults may take large mouthfuls of sand, sift out small animals and expel the remaining substrate through the mouth or gill openings. This can produce clouds of sediment and may deposit sand onto nearby corals.

Juveniles are dark brown with several narrow pale bars and light markings radiating from the eyes. Females and mature males develop broader contrasting body bands and colourful facial markings, while large males may display green-tinted bars, yellow fin markings and darker coloration around the head.

This species can change sex, with dominant females potentially transitioning into mature males.

Reef Safe:
Reef Safe with Caution

The Barred Thicklip Wrasse does not normally target healthy coral tissue, but it is a powerful predator of mobile reef invertebrates.

Ornamental shrimps, crabs, hermit crabs, snails, clams, brittle stars, sea urchins, worms and other benthic animals may be eaten. Its sand-sifting behaviour can also bury low-positioned corals and move unsecured coral pieces.

It is best suited to a fish-only-with-live-rock aquarium or a robust reef system where losses among the clean-up crew and sand-bed fauna can be accepted.

Special Requirements or Care Notes:
Provide a broad area of fine to medium marine sand that allows the fish to sift and bury naturally without damaging its mouth, gills or scales. Avoid sharp coral gravel and excessively coarse substrate.

Rockwork must be stable and positioned directly on the aquarium base or secure supports. The wrasse may move substrate and disturb loose structures while searching for prey.

A tightly fitted aquarium cover is essential. Large wrasses are powerful jumpers and may escape through gaps around cables, pipework, feeding openings and overflow boxes.

Provide powerful biological filtration, efficient protein skimming, strong water movement and excellent oxygenation. This active carnivore produces a considerable waste load and may suspend sediment while feeding.

Avoid ornamental crustaceans, echinoderms and molluscs. Compatibility risks increase significantly as the fish grows and develops stronger jaws.

Select an alert specimen with clear eyes, intact lips and a rounded body profile. Mouth or lip damage caused during collection and transport can prevent normal feeding.

The wrasse may be shy immediately after introduction or remain buried temporarily. Provide sheltered caves and visual barriers while retaining extensive open swimming and foraging space.

A carefully managed quarantine period is recommended. Include a container of suitable soft sand and monitor treatment closely, as wrasses can react poorly to rapid salinity changes, low oxygen levels and aggressive medication regimes.

Suitable for:
Experienced fishkeepers

Availability:
Rare or occasional in trade

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.