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The Blue-throated Wrasse (Notolabrus tetricus) is a medium-sized, robust wrasse endemic to the temperate waters of southeastern Australia. It is a protogynous hermaphrodite, meaning individuals typically mature as females and later transition to males. This species exhibits significant sexual dimorphism and ontogenetic color changes, making identification sometimes challenging without familiarity with its life stages. It is a common inhabitant of rocky reefs and kelp forests, playing an important ecological role as a mesopredator and grazer.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Males (terminal phase) are striking, with a dark blue to black head and throat, often with iridescent blue markings, contrasting with a reddish-brown to olive-green body. A prominent white or pale band often runs along the lateral line. Females (initial phase) and juveniles are typically mottled reddish-brown, olive-green, or grey, often with irregular darker blotches and a paler belly. They lack the distinct blue throat of the males. Coloration can vary geographically and with mood.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Pronounced sexual dimorphism, with males having a distinctive blue head and throat., Thick, fleshy lips., Large, canine-like teeth at the front of the jaws, followed by smaller conical teeth., A single continuous dorsal fin., Relatively large scales.
- Dorsal fin
- Single, long dorsal fin with 9 spines and 11-12 soft rays. The spinous portion is typically lower than the soft-rayed portion.
- Tail fin
- Rounded to slightly truncate caudal fin.
- Pectoral fin
- Large, rounded pectoral fins.
- Distinctive fins
- Pelvic fins are relatively small and located ventrally.
Identification Tips
Male Coloration
Look for the distinctive dark blue to black head and throat, often with iridescent blue markings, contrasting with a reddish-brown body. A pale lateral line stripe is usually present.
Female/Juvenile Coloration
Females and juveniles are more cryptically colored, typically mottled reddish-brown, olive-green, or grey with irregular darker blotches. They lack the blue throat.
Body Shape
Robust, compressed body typical of many wrasses.
Mouth and Teeth
Fleshy lips and prominent canine teeth at the front of the jaws are characteristic of the genus Notolabrus.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 1 to 60 meters, occasionally deeper.
- Environment
- Inhabits rocky reefs, kelp forests, and areas with mixed sand and rubble. Juveniles and smaller females often found in shallower, more sheltered areas, while larger males prefer deeper reef structures.
- Geographic range
- Endemic to southeastern Australia, from southern Queensland, along the coasts of New South Wales, Victoria, Tasmania, and eastern South Australia.
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 500 gallons
- Temperature: 14-20°C (57-68°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in a species-specific tank or with other large, robust, temperate marine fish. Avoid keeping with smaller, docile species or other wrasses unless the tank is exceptionally large and offers ample hiding spots.
- Special requirements: Requires a large, well-established temperate marine aquarium with significant rockwork for hiding and foraging. Excellent filtration and strong water movement are essential. Live rock and a deep sand bed are beneficial for natural foraging behaviors and potential burrowing at night. Temperature control is critical for this temperate species.
Wild Information
- Conservation status: least concern
- Seasonality: Can be caught year-round, but fishing activity may vary with seasonal weather patterns and spawning aggregations.
- Market price: Variable, depending on region and demand. Primarily a recreational fishing target.
- Commercial importance: low
- Taste: Mild, white, flaky flesh.
- Texture: Firm, moist.
- Cooking methods: Baked, Grilled, Pan-fried, Steamed
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Sex Changebehavior
Blue-throated Wrasses are protogynous hermaphrodites, meaning they start life as females and can later change sex to become males.
Territorial Malesbehavior
Large terminal phase males are highly territorial, defending harems of females and specific spawning sites.
Dietary Generalistsbehavior
Their diet is diverse, including crustaceans, molluscs, echinoderms, and small fish, making them important mesopredators in their ecosystem.
Longevityinteresting
Blue-throated Wrasses can live for over 20 years, with larger males often being the oldest individuals.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions beyond standard fish handling to avoid fin spines and sharp teeth. Can deliver a painful bite if provoked, so handle with care.
Similar Species
Brown-spotted Wrasse
Notolabrus parilus
Notolabrus parilus generally has a more uniform brown or greenish-brown coloration with scattered darker spots, lacking the distinct blue head and throat of male N. tetricus. Its geographic range is primarily Western Australia.
Maori Wrasse
Ophthalmolepis lineolata
While also a wrasse from the same region, Ophthalmolepis lineolata has a more elongated body, a distinctive dark stripe through the eye, and often prominent horizontal stripes on the body, which are absent in N. tetricus.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Labriformes
- Family
- Labridae
- Genus
- Notolabrus
- Species
- Notolabrus tetricus
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