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Nemipterus randalli, commonly known as the Rosy Threadfin Bream, is a demersal fish belonging to the family Nemipteridae. It is characterized by its slender body, distinctive coloration, and the elongated upper caudal fin ray in adults. This species is an important component of artisanal and commercial fisheries throughout its range.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Body silvery-pink to reddish dorsally, fading to silvery-white ventrally. A prominent reddish-yellow blotch or streak often present on the upper operculum (gill cover). Fins are generally pinkish or yellowish. The dorsal fin often has a yellow margin. The caudal fin is pinkish with a yellow upper lobe and a reddish tip on the elongated upper ray.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Elongated upper caudal fin ray in adults, which can be quite long., Reddish-yellow blotch on the upper operculum., Yellow margin on the dorsal fin., 10-11 transverse bars on the body, often faint or indistinct, especially in larger specimens.
- Dorsal fin
- Single dorsal fin with X spines and 9 soft rays. The first two dorsal spines are typically short.
- Tail fin
- Forked caudal fin, with the upper lobe significantly elongated into a filament in adults.
- Pectoral fin
- Pectoral fins are relatively long, reaching to or beyond the anus.
- Distinctive fins
- Pelvic fins are long, reaching to or beyond the anus, with a yellow tint.
Identification Tips
Caudal Fin
Look for the elongated upper ray of the caudal fin, especially in adult specimens. This is a key distinguishing feature.
Opercular Spot
Observe the reddish-yellow blotch on the upper part of the gill cover (operculum).
Dorsal Fin Margin
Note the yellow margin along the dorsal fin.
Body Coloration
The overall silvery-pink to reddish body color, fading to white ventrally, is characteristic.
Fin Length
Pectoral and pelvic fins are relatively long, often reaching to or past the anus.
Habitat
- Water type
- saltwater
- Depth
- Typically found on sandy or muddy bottoms, often near rocky reefs or rubble, at depths ranging from 10 to 120 meters, most commonly between 20 and 80 meters.
- Environment
- Demersal, inhabiting continental shelves and upper slopes. Often found in schools.
- Geographic range
- Indo-West Pacific: Red Sea and East Africa eastward to Indonesia, north to southern Japan, and south to northern Australia. Particularly common in the Arabian Sea, Persian Gulf, and off the coasts of India and Southeast Asia.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 200 gallons
- Temperature: 22-26°C (72-79°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally peaceful with other non-aggressive, similarly sized marine fish. Avoid housing with very small fish or aggressive species.
- Special requirements: Requires a large tank with plenty of open swimming space and sandy substrate for foraging. Good water quality and stable parameters are crucial. Not commonly kept in home aquaria due to size and specific needs.
Wild Information
- Conservation status: least concern
- Seasonality: Available year-round in many parts of its range, with peak catches often influenced by local fishing regulations and weather patterns.
- Market price: Varies by region and market demand, generally moderate.
- Commercial importance: high
- Taste: Mild, slightly sweet
- Texture: Flaky, tender white flesh
- Cooking methods: Steaming, Frying, Grilling, Baking
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Elongated Tailinteresting
The most striking feature of adult Rosy Threadfin Bream is the greatly elongated upper ray of its caudal fin, which can be as long as the rest of the fin.
Demersal Lifestylebehavior
These fish are typically found near the seabed, foraging for small invertebrates and fish.
Schooling Behaviorbehavior
Nemipterus randalli often forms schools, especially when foraging or migrating, which can make them easier targets for fisheries.
Dietary Habitsbehavior
Their diet primarily consists of small benthic invertebrates such as crustaceans, polychaetes, and mollusks, as well as small fish.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions beyond standard fish handling practices. Spines are not venomous but can cause minor punctures if not handled carefully.
Similar Species
Japanese Threadfin Bream
Nemipterus japonicus
N. japonicus typically has a longer, more pointed snout, and the elongated caudal filament is usually longer and more pronounced. The opercular spot in N. japonicus is often more diffuse or absent, and its body coloration can be more uniformly pinkish without the distinct reddish-yellow opercular blotch of N. randalli.
Ornate Threadfin Bream
Nemipterus hexodon
N. hexodon has a more distinct yellow stripe along the lateral line and often has more prominent yellow markings on the fins. Its caudal fin filament is generally shorter or absent compared to N. randalli.
Delagoa Threadfin Bream
Nemipterus delagoae
N. delagoae typically has a more pronounced yellow stripe below the lateral line and a less elongated caudal fin filament. The opercular spot may also differ in intensity or presence.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Nemipteridae
- Genus
- Nemipterus
- Species
- N. randalli
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