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Pseudanthias tuka, commonly known as the Purple Anthias, is a vibrant and active species of marine fish belonging to the family Serranidae (sea basses and groupers). It is highly prized in the aquarium trade for its striking coloration and schooling behavior. This species exhibits sexual dimorphism, with males displaying more intense coloration and elongated fin rays.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Males are predominantly purple to magenta on the anterior body, transitioning to yellow or orange posteriorly, especially on the caudal fin and dorsal fin. A distinctive yellow stripe often runs along the dorsal fin base. Females are generally more uniformly pinkish-purple with less intense yellow. Juveniles resemble females. Coloration can vary slightly based on geographic location and mood.
- Scale type
- ctenoid
- Mouth position
- superior
- Distinctive features
- Elongated third dorsal spine in mature males., Lunate (crescent-shaped) caudal fin., Bright yellow stripe along the dorsal fin base (more prominent in males).
- Dorsal fin
- Single dorsal fin with X spines and 16-17 soft rays. The third dorsal spine is notably elongated in mature males.
- Tail fin
- Lunate (crescent-shaped) caudal fin.
- Pectoral fin
- 17-18 rays, typically clear to slightly yellowish.
- Distinctive fins
- Pelvic fins are relatively long, often reaching the anal fin origin.
Identification Tips
Coloration
Look for the distinct purple to magenta anterior body transitioning to yellow/orange posteriorly, especially in males. Females are more uniformly pinkish-purple.
Dorsal Fin
Observe the third dorsal spine; it is significantly elongated in mature males, a key distinguishing feature.
Caudal Fin
The deeply lunate (crescent-shaped) caudal fin is characteristic.
Behavior
Often seen in large, active schools feeding in the water column above reef structures.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths of 10 to 60 meters (33 to 197 feet), occasionally deeper.
- Environment
- Associated with outer reef slopes, drop-offs, and areas with strong currents, where they feed on zooplankton in the water column. They often form large aggregations near coral formations or rocky outcrops, providing shelter.
- Geographic range
- Indo-Pacific region, ranging from the Maldives and Sri Lanka eastward to Fiji, and from southern Japan southward to Australia (Great Barrier Reef).
Aquarium Information
- Care level: advanced
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 75 gallons (280 liters)
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally peaceful with other non-aggressive reef-safe fish. Best kept in groups of one male and multiple females. Avoid housing with aggressive or much larger fish that may outcompete them for food or harass them.
- Special requirements: Requires a well-established reef aquarium with plenty of live rock for hiding and perching. Strong water flow is essential, mimicking their natural habitat. They are planktivores and require multiple small feedings throughout the day to maintain health and coloration. A tight-fitting lid is necessary as they are known jumpers.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for availability; collected year-round from their natural habitats.
- Market price: Moderate to high, depending on size and availability.
- Commercial importance: medium
- Taste: Not typically consumed due to small size and value as an ornamental fish.
- Texture: N/A
- Nutritional value: N/A
Key Facts
Protogynous Hermaphroditesbehavior
Like many anthias species, Pseudanthias tuka are protogynous hermaphrodites, meaning all individuals are born female and can change sex to male if the dominant male in a group is removed or dies.
Schooling Behaviorbehavior
They are typically found in large, active schools, often numbering in the hundreds, feeding on zooplankton in the water column above reef structures.
Sexual Dimorphisminteresting
Males are significantly more colorful and possess an elongated third dorsal spine, making them easily distinguishable from females.
Planktivorous Dietbehavior
Their diet consists primarily of zooplankton, which they actively pick from the water column, necessitating frequent feedings in captivity.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions beyond standard fish handling to avoid stress or injury to the fish. They are not venomous and do not possess sharp spines that pose a significant threat.
Similar Species
Dispar Anthias
Pseudanthias dispar
P. dispar males have a more pronounced orange-red dorsal stripe and a less intensely purple body, often more orange-pink. The caudal fin lobes of P. dispar are typically more elongated and pointed, and the third dorsal spine is not as dramatically elongated as in P. tuka males.
Squamipinnis Anthias
Pseudanthias squamipinnis
P. squamipinnis (Lyretail Anthias) males are typically orange-red with a prominent lyre-shaped caudal fin and a much less elongated third dorsal spine. Females are orange-yellow. The overall body shape and fin morphology are distinct from P. tuka.
Bicolor Anthias
Pseudanthias bicolor
P. bicolor has a distinct two-toned coloration, typically purple anteriorly and yellow posteriorly, but lacks the elongated third dorsal spine and the specific yellow dorsal stripe of P. tuka. Its caudal fin is also less deeply lunate.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Serranidae
- Genus
- Pseudanthias
- Species
- Pseudanthias tuka
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