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Pseudanthias dispar, commonly known as the Redfin Anthias, is a small, vibrant marine fish belonging to the family Serranidae (sea basses and groupers). It is a protogynous hermaphrodite, meaning individuals mature as females and can later change sex to male. These fish are typically found in large aggregations, often numbering in the hundreds, hovering above coral reefs and feeding on zooplankton. They are highly active and contribute significantly to the visual appeal and ecological dynamics of their reef habitats.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Males are typically more brightly colored than females. Females exhibit an orange-pink to reddish-orange body with a distinct red stripe running from the snout through the eye to the caudal peduncle. The dorsal fin is often yellow. Males develop a more intense red coloration, particularly on the dorsal and caudal fins, and may have an elongated third dorsal spine. The caudal fin is deeply forked, often with red tips.
- Scale type
- ctenoid
- Mouth position
- superior
- Distinctive features
- Sexual dimorphism (males more vibrant, elongated dorsal spine), Red stripe through the eye in females, Deeply forked caudal fin, often with red tips, Small size, typically under 10 cm
- Dorsal fin
- 10 spines, 16-17 soft rays; third dorsal spine often elongated in males.
- Tail fin
- Deeply forked, often with red tips.
- Pectoral fin
- 16-18 rays, clear to slightly reddish.
- Distinctive fins
- Pelvic fins are relatively long and pointed.
Identification Tips
Coloration (Female)
Look for an orange-pink to reddish-orange body with a prominent red stripe extending from the snout through the eye to the caudal peduncle. The dorsal fin is often yellow.
Coloration (Male)
Males are more intensely red, especially on the dorsal and caudal fins. They often have an elongated third dorsal spine, which is a key distinguishing feature.
Caudal Fin
The caudal (tail) fin is deeply forked, a characteristic shared by many Pseudanthias species, but the red tips are often pronounced in P. dispar.
Behavior
Observe their schooling behavior; they typically form large, active aggregations hovering in the water column above the reef, darting to catch zooplankton.
Habitat
- Water type
- saltwater
- Depth
- 2-30 meters (6-100 feet), typically in shallower, current-swept areas of outer reef slopes and drop-offs.
- Environment
- Coral reefs, particularly outer reef slopes, drop-offs, and areas with strong currents. They form large, active schools hovering above the reef, feeding on zooplankton.
- Geographic range
- Indo-Pacific region, including the Red Sea, East Africa to Samoa, north to southern Japan, and south to Australia (Great Barrier Reef).
Aquarium Information
- Care level: intermediate
- 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 compatible with other peaceful reef-safe fish. Avoid housing with aggressive species or very large predators. Best kept in groups of one male and multiple females.
- Special requirements: Requires a well-established reef aquarium with plenty of live rock for hiding and perching. A strong current is beneficial as they are accustomed to feeding in open water. Multiple feedings per day of small, meaty foods are essential due to their high metabolism. They are prone to jumping, so a tight-fitting lid is necessary.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding occurs year-round in tropical waters, with peak activity often influenced by lunar cycles.
- Market price: Moderate
- Commercial importance: low
- Taste: Not typically consumed due to small size and reef association.
- Texture: N/A
- Nutritional value: N/A
Key Facts
Protogynous Hermaphroditebehavior
Redfin Anthias are protogynous hermaphrodites, meaning all individuals are born female and can later transition to male if the dominant male is removed or dies. This social structure is common among many anthias species.
Schooling Behaviorbehavior
They form large, dynamic schools, often numbering in the hundreds, which provides safety in numbers against predators and facilitates efficient feeding on zooplankton in open water.
Indicator of Reef Healthinteresting
The presence of large, healthy schools of Redfin Anthias can be an indicator of a thriving coral reef ecosystem, as they rely on abundant zooplankton and intact reef structures for shelter.
Sexual Dimorphismbehavior
Males are distinctly more colorful and often possess an elongated third dorsal spine, making them easily distinguishable from females, especially during breeding displays.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to minimize stress. They are not venomous and do not possess dangerous spines.
Similar Species
Squareback Anthias
Pseudanthias pleurotaenia
P. pleurotaenia males have a distinctive square-shaped blotch on their flanks and a more robust body shape. Females are generally orange with a purple stripe, differing from the red stripe of P. dispar.
Lyretail Anthias
Pseudanthias squamipinnis
P. squamipinnis males have a prominent lyre-shaped caudal fin and a more pronounced red spot on the pectoral fin base. Females are typically orange with a less distinct lateral stripe than P. dispar.
Bartlett's Anthias
Pseudanthias bartlettorum
P. bartlettorum has a more purplish-pink body with a yellow dorsal region and caudal fin. It lacks the distinct red stripe through the eye seen in female P. dispar.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Serranidae
- Genus
- Pseudanthias
- Species
- dispar
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