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Thalassoma duperrey, commonly known as the Saddle Wrasse, is a vibrant and active species of wrasse endemic to the Hawaiian Islands. It is a protogynous hermaphrodite, meaning individuals typically mature as females and can later change sex to male. This species plays a significant ecological role in its reef habitat as a diurnal predator of small invertebrates and a cleaner fish, removing parasites from other fish species. Its striking coloration and active swimming behavior make it a noticeable component of Hawaiian coral reef ecosystems.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Initial phase (females and juvenile males) are typically green to greenish-brown dorsally, fading to white or pale green ventrally. A prominent dark reddish-brown to black saddle-like blotch is present on the upper flank, extending onto the dorsal fin. Terminal phase males are more brightly colored, often with a blue-green body, a distinct orange-red band or blotch behind the pectoral fin, and a blue head with irregular pink or red markings. The caudal fin can be blue with red margins.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Prominent dark saddle-like blotch on the upper flank, extending onto the dorsal fin (characteristic of both initial and terminal phases, though more pronounced in initial phase)., Elongated body with a pointed snout., Terminal phase males exhibit vibrant blue-green and orange-red coloration with distinctive head markings.
- Dorsal fin
- Single dorsal fin with 8 spines and 13 soft rays. The spinous portion is continuous with the soft-rayed portion.
- Tail fin
- Truncate to slightly emarginate caudal fin in initial phase, becoming more lunate or slightly emarginate with elongated lobes in terminal phase males.
- Pectoral fin
- Large, fan-like pectoral fins, typically with 13 rays.
- Distinctive fins
- Pelvic fins are small and located thoracically.
Identification Tips
Saddle Mark
Look for the distinctive dark reddish-brown to black saddle-like blotch on the upper flank, just below the dorsal fin. This is present in all life stages.
Coloration (Initial Phase)
Initial phase individuals are generally greenish-brown with a paler belly and the prominent saddle mark.
Coloration (Terminal Phase)
Terminal phase males are much more colorful, with a blue-green body, an orange-red band behind the pectoral fin, and blue heads with pink/red markings. The caudal fin often has blue and red hues.
Body Shape
Its elongated, torpedo-like body and pointed snout are characteristic of the genus Thalassoma.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow reef environments from 1 to 60 meters (3 to 200 feet), most commonly in depths less than 20 meters.
- Environment
- Coral reefs, rocky shorelines, surge zones, and areas with mixed sand and rubble. They are often seen actively swimming over the reef, foraging during the day.
- Geographic range
- Endemic to the Hawaiian Islands, including the main Hawaiian Islands and the Northwestern Hawaiian Islands.
Aquarium Information
- Care level: intermediate
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 75 gallons
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Can be kept with other semi-aggressive to aggressive fish of similar size. Avoid keeping with very small, docile fish or other wrasses unless the tank is very large and introduced simultaneously. May harass or consume small invertebrates.
- Special requirements: Requires a well-established aquarium with plenty of live rock for hiding and foraging. A sand bed is beneficial as they may bury themselves at night or when stressed. Good water quality and strong filtration are essential. Provide a secure lid as they are known jumpers.
Wild Information
- Conservation status: least concern
- Seasonality: Present year-round in its natural habitat, no specific seasonal patterns for abundance or behavior are noted.
- Market price: N/A
- Commercial importance: low
- Taste: Mild, white flesh
- Texture: Flaky
- Cooking methods: Baked, Steamed, Fried
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Hawaiian Endemicinteresting
The Saddle Wrasse is found exclusively in the waters surrounding the Hawaiian Islands, making it a unique part of the local marine biodiversity.
Sex Changerbehavior
Like many wrasses, the Saddle Wrasse is a protogynous hermaphrodite, meaning individuals are born female and can later transition into males.
Diurnal Foragerbehavior
These wrasses are active during the day, constantly swimming over reefs and picking at rocks and corals for small invertebrates.
Cleaner Fishbehavior
Juvenile and sometimes adult Saddle Wrasses are known to act as cleaner fish, removing parasites from other reef inhabitants.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to avoid injury to the fish or yourself (e.g., fin spines). They are not venomous.
Similar Species
Christmas Wrasse
Thalassoma trilobatum
The Christmas Wrasse has a more mottled green body with irregular red spots and lines, and lacks the distinct saddle blotch of T. duperrey. Its caudal fin is typically more rounded.
Surge Wrasse
Thalassoma purpureum
The Surge Wrasse (especially terminal males) can be very colorful, but typically has a more purplish-red body with green markings and a distinct V-shaped caudal fin. It lacks the prominent saddle mark.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Labridae
- Genus
- Thalassoma
- Species
- duperrey
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