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Hemigymnus fasciatus, commonly known as the Barred Thicklip, is a large and robust species of wrasse characterized by its distinctive thick, fleshy lips and prominent vertical banding. It is a diurnal fish, actively foraging during the day and seeking shelter in crevices or under rocks at night. This species plays an important ecological role in coral reef ecosystems as a benthic invertebrate feeder.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Adults typically display a striking pattern of 5-6 broad, dark vertical bands (ranging from dark brown to black) alternating with narrower, pale bands (white to yellowish) on a greenish-white to yellowish body. The head is often greenish-brown with irregular darker markings. Juveniles are generally paler with less distinct banding. The thick, fleshy lips are a prominent feature, often appearing pale or yellowish.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Thick, fleshy lips, 5-6 prominent dark vertical bands on the body, Large size for a wrasse, Protrusible mouth with conical teeth
- Dorsal fin
- 9 spines, 10-11 soft rays; continuous
- Tail fin
- Rounded to slightly truncate
- Pectoral fin
- 14-15 rays; relatively large
- Distinctive fins
- Pelvic fins are relatively short.
Identification Tips
Body Pattern
Look for the characteristic 5-6 broad, dark vertical bands alternating with pale bands. This is the most distinguishing feature.
Lips
Observe the exceptionally thick, fleshy lips, which are a defining characteristic of the genus Hemigymnus.
Size
Adults are relatively large for a wrasse, reaching up to 50 cm in total length.
Head Coloration
Note the greenish-brown head with irregular darker markings, contrasting with the banded body.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 1 to 30 meters (3 to 100 feet), occasionally deeper.
- Environment
- Inhabits coral reefs, particularly in areas with mixed sand and rubble, outer reef slopes, and lagoons. Prefers areas with abundant coral growth and shelter. Juveniles are often found in shallower, more protected reef flats.
- Geographic range
- Widespread Indo-Pacific distribution, from the Red Sea and East Africa across to the Line Islands and Tuamotu Archipelago, north to southern Japan, and south to New South Wales, Australia.
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 250 gallons
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in large, mature reef aquariums with robust tank mates. May harass smaller, more docile fish. Not suitable for tanks with small invertebrates like ornamental shrimp or crabs, as they will be preyed upon. Requires ample swimming space and rockwork for shelter.
- Special requirements: Requires a deep sand bed (at least 4-6 inches) for burrowing at night or when stressed. Excellent filtration and stable water parameters are crucial due to its large size and feeding habits. Provide a varied diet of meaty foods.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for reproduction or migration are widely documented; present year-round in its habitat.
- Market price: Low
- Commercial importance: low
- Taste: Mild, white flesh
- Texture: Firm
- Cooking methods: Baked, Grilled, Steamed
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Lip Serviceinteresting
The genus name 'Hemigymnus' means 'half naked' or 'half bare', referring to the scales not extending onto the head, while 'fasciatus' means 'banded', referring to its distinctive body pattern.
Sand Sleeperbehavior
Like many wrasses, the Barred Thicklip buries itself in the sand at night or when threatened, using its thick lips to help dig into the substrate.
Dietary Diversitybehavior
Despite its large size, the Barred Thicklip primarily feeds on small benthic invertebrates, including crustaceans, mollusks, and worms, which it extracts from the sand and rubble using its protrusible mouth and strong teeth.
Protogynous Hermaphroditeevolution
Hemigymnus fasciatus is a protogynous hermaphrodite, meaning individuals are born female and can later change sex to male. Large males are often more intensely colored.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Generally safe to handle, but like all fish, care should be taken to avoid fin spines. Its large size and powerful jaws could deliver a painful bite if provoked, though this is rare.
Similar Species
Blackedge Thicklip
Hemigymnus melapterus
H. melapterus has a distinct two-tone coloration, with the anterior half of the body pale and the posterior half dark, often with a black margin on the dorsal and anal fins. It lacks the prominent vertical banding of H. fasciatus.
Checkerboard Wrasse
Halichoeres hortulanus
While also a wrasse, H. hortulanus has a checkerboard-like pattern of dark spots and lines, and lacks the thick lips and broad vertical bands of H. fasciatus. It is also generally smaller.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Labriformes
- Family
- Labridae
- Genus
- Hemigymnus
- Species
- fasciatus
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