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Hologymnosus doliatus, commonly known as the Pastel Ringwrasse, is a species of marine ray-finned fish belonging to the family Labridae. It is a relatively large and slender wrasse, known for its distinctive color patterns that vary significantly between juvenile, initial phase (IP), and terminal phase (TP) individuals. This species is a common inhabitant of coral reefs across the Indo-Pacific, playing an ecological role as a diurnal predator of small invertebrates and fishes.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Juveniles are typically pale with a dark mid-lateral stripe. Initial phase (IP) individuals are generally pale greenish to yellowish-brown with numerous narrow, dark vertical bars or rings along the body. Terminal phase (TP) males are strikingly different, often exhibiting a vibrant blue-green to olive-green body with a distinct pale to yellowish head, and often a dark bar or blotch behind the pectoral fin. The vertical bars may become less distinct or disappear in large males. A prominent dark spot is often present on the operculum.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Elongated, cylindrical body, Small, protractile mouth, Continuous dorsal fin, Coloration changes dramatically with age and sex (protogynous hermaphrodite), Lack of scales on the head and anterior part of the body
- Dorsal fin
- Continuous, with 9 spines and 11-12 soft rays. Spines are relatively short.
- Tail fin
- Truncate to slightly emarginate in juveniles and females, becoming more emarginate or lunate in large males.
- Pectoral fin
- Relatively short and rounded, with 13 rays.
- Distinctive fins
- Pelvic fins are small and located thoracically.
Identification Tips
Body Shape
Look for the distinctly elongated, almost eel-like body shape, which is characteristic of the genus Hologymnosus.
Coloration (Juvenile/IP)
Initial phase individuals are recognized by their pale body with numerous narrow, dark vertical bars or rings. The number and prominence of these bars can vary.
Coloration (TP Male)
Terminal phase males are unmistakable with their vibrant blue-green to olive body, often a contrasting pale head, and a dark bar or blotch behind the pectoral fin. The vertical bars may be faint or absent.
Head and Scales
Note the relatively small head and the absence of scales on the head and the anterior part of the body, a key generic characteristic.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths of 1 to 30 meters (3 to 100 feet), occasionally deeper.
- Environment
- Inhabits clear, shallow coastal waters, particularly on outer reef slopes, reef flats, and lagoon reefs with mixed sand and rubble bottoms, often near coral formations. They prefer areas with abundant invertebrate prey.
- Geographic range
- Widespread throughout the Indo-Pacific region, from the Red Sea and East Africa eastward 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: 180 gallons
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept with other large, robust fish. Can be aggressive towards smaller or more docile tankmates. Not reef-safe as it will consume small invertebrates and possibly small fish.
- Special requirements: Requires a deep sand bed (at least 4-6 inches) for burrowing at night or when startled. Needs ample swimming space and rockwork for shelter. A tightly fitting lid is essential as they are known jumpers.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for availability; present year-round in its natural habitat.
- Market price: Moderate to high for aquarium trade specimens, depending on size and coloration.
- Commercial importance: low
- Taste: Mild, white flesh
- Texture: Flaky, firm
- Cooking methods: Grilled, Baked, Steamed, Fried
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Gender Benderbehavior
Pastel Ringwrasse are protogynous hermaphrodites, meaning all individuals are born female and can later change sex to male. This dramatic transformation is accompanied by significant changes in coloration.
Sand Sleeperbehavior
Like many wrasses, Hologymnosus doliatus buries itself in the sand at night or when threatened, using its pointed snout to quickly dive into the substrate for protection.
Dietary Generalistbehavior
Despite its predatory nature, the Pastel Ringwrasse has a varied diet in the wild, consuming a range of small benthic invertebrates such as crustaceans, mollusks, and echinoderms, as well as small fishes.
Elongated Eleganceinteresting
The genus name 'Hologymnosus' is derived from Greek, meaning 'entirely naked', referring to the lack of scales on the head and anterior body, a distinctive feature of these wrasses.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Generally harmless to humans. Handle with care to avoid fin spines, which can cause minor punctures. They are strong and can be slippery, so use appropriate handling techniques if necessary.
Similar Species
Cigar Wrasse
Cheilio inermis
While also elongated, Cheilio inermis typically has a more uniform coloration (often mottled brown or green) and lacks the distinct vertical barring or vibrant terminal phase coloration of Hologymnosus doliatus. Cheilio inermis also has a more pointed snout.
Other Hologymnosus species
Hologymnosus annulatus (Ringed Wrasse)
Hologymnosus annulatus also has vertical bars, but typically fewer and broader bars, especially in the initial phase. Terminal phase males of H. annulatus often have a more pronounced dark band through the eye and a different head coloration compared to H. doliatus. Careful examination of fin ray counts and specific color patterns is often required for definitive identification between species within the genus.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Labridae
- Genus
- Hologymnosus
- Species
- Hologymnosus doliatus
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