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Nemipterus furcosus, commonly known as the Threadfin Bream, is a demersal fish belonging to the family Nemipteridae. It is characterized by its elongated body, distinctive coloration, and the filamentous extension on the upper lobe of its caudal fin, which gives it its common name. This species is an important component of artisanal and commercial fisheries across its range.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Body silvery-pink to reddish dorsally, fading to silvery-white ventrally. Often has a yellowish stripe along the lateral line. Fins are typically yellowish or pinkish. The upper lobe of the caudal fin often has a yellow or reddish tip and a prominent filamentous extension.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Prominent filamentous extension on the upper lobe of the caudal fin., Yellowish stripe along the lateral line., Often a yellow blotch or streak below the eye., Small, conical teeth in both jaws.
- Dorsal fin
- Single dorsal fin with 10 spines and 9 soft rays. The spines are moderately strong.
- Tail fin
- Deeply forked caudal fin, with the upper lobe significantly longer and bearing a long, yellow or reddish filamentous extension.
- Pectoral fin
- Long and pointed, reaching to or beyond the anus.
- Distinctive fins
- Pelvic fins are relatively long, reaching to or beyond the anus, and are typically yellowish.
Identification Tips
Caudal Fin Filament
Look for the distinctive long, yellow or reddish filamentous extension on the upper lobe of the caudal fin. This is the most reliable distinguishing feature.
Lateral Line Stripe
Observe the yellowish stripe running along the lateral line, which can be a helpful secondary identifier.
Body Coloration
Note the overall silvery-pink to reddish body color, fading to white ventrally, often with yellowish fins.
Fin Ray Count
Count the dorsal fin rays (10 spines, 9 soft rays) and anal fin rays (3 spines, 7 soft rays) for definitive identification, especially when distinguishing from closely related species.
Habitat
- Water type
- saltwater
- Depth
- Typically found on sandy or muddy bottoms at depths ranging from 10 to 100 meters, occasionally deeper.
- Environment
- Demersal, inhabiting continental shelves and slopes. Often found in schools over soft substrates, near reefs or rocky outcrops.
- Geographic range
- Indo-West Pacific: widespread from the Persian Gulf and Arabian Sea to Japan, the Philippines, Indonesia, and northern Australia.
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 marine species of similar size. Avoid housing with very small fish or aggressive predators.
- Special requirements: Requires a well-established marine aquarium with plenty of open swimming space and sandy substrate for foraging. Good water quality and stable parameters are crucial. Not commonly kept in home aquariums 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 seasons and weather patterns.
- Market price: Varies significantly by region and market demand, generally moderate.
- Commercial importance: medium
- Taste: Mild, slightly sweet
- Texture: Flaky, tender white flesh
- Cooking methods: Steaming, Frying, Grilling, Baking, Curries
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Caudal Filament Functionbehavior
The long filamentous extension on the caudal fin of Nemipterus furcosus is thought to play a role in sexual display or as a lure for prey, though its exact function is not fully understood.
Dietary Habitsbehavior
Threadfin breams are primarily carnivorous, feeding on a variety of benthic invertebrates such as crustaceans, polychaetes, and small cephalopods, as well as small fish.
Schooling Behaviorbehavior
Nemipterus furcosus often forms schools, particularly when foraging over sandy or muddy bottoms, which can enhance their feeding efficiency and provide protection from predators.
Reproductive Strategybehavior
Like many nemipterids, N. furcosus is a protogynous hermaphrodite, meaning individuals mature first as females and later transition to males, although this can vary geographically.
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 fin pricks. The spines are not venomous.
Similar Species
Japanese Threadfin Bream
Nemipterus japonicus
N. japonicus typically has a shorter caudal filament, if present, and often exhibits a red blotch on the upper part of the operculum, which N. furcosus lacks. The body coloration can also differ subtly, with N. japonicus often having more pronounced yellow lines on the body.
Ornate Threadfin Bream
Nemipterus hexodon
N. hexodon usually has a more pronounced yellow blotch on the operculum and lacks the distinct long caudal filament of N. furcosus. Its body often has more distinct yellow longitudinal stripes.
Delagoa Threadfin Bream
Nemipterus delagoae
N. delagoae has a shorter caudal filament and typically displays a series of yellow spots or blotches along the lateral line, which are absent in N. furcosus.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Nemipteridae
- Genus
- Nemipterus
- Species
- furcosus
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