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The Gangetic Scabbardfish (Eupleurogrammus muticus) is a pelagic, predatory fish belonging to the family Trichiuridae. It is characterized by its elongated, ribbon-like body, silvery coloration, and a distinctive lack of pelvic fins and a caudal fin, tapering to a whip-like tail. This species is an active hunter, primarily feeding on smaller fish and crustaceans in coastal and estuarine waters.
Physical Characteristics
- Body shape
- eel-like
- Coloration
- Uniformly silvery, often with a metallic sheen; fins are translucent or dusky.
- Scale type
- none
- Mouth position
- superior
- Distinctive features
- Extremely elongated, ribbon-like body, highly compressed laterally., Head is relatively small with a pointed snout., Large, sharp teeth in both jaws, including prominent canines at the front., Absence of pelvic fins., Caudal fin is absent, with the body tapering to a fine, whip-like filament., Lateral line runs close to the ventral profile anteriorly, then curves upwards to the mid-lateral line posteriorly.
- Dorsal fin
- A single, long dorsal fin extending almost the entire length of the body, originating just behind the head. It consists of 4-5 spines followed by 100-108 soft rays. The anterior rays are often elevated.
- Tail fin
- Absent, body tapers to a filament.
- Pectoral fin
- Small, located high on the body, with 11-13 rays.
- Distinctive fins
- Anal fin is represented by a series of small, detached finlets or spines embedded in the skin along the ventral margin, becoming more prominent posteriorly.
Identification Tips
Body Shape
Look for the extremely elongated, ribbon-like, and highly compressed body. This is a key characteristic of scabbardfish.
Caudal Fin
The complete absence of a caudal fin, with the body tapering to a fine filament, is a definitive feature of Eupleurogrammus muticus and other species in its genus.
Pelvic Fins
Note the absence of pelvic fins. This distinguishes it from some other Trichiuridae species.
Teeth
Observe the prominent, sharp canine teeth in the front of both jaws, indicative of its predatory nature.
Lateral Line
The lateral line runs close to the ventral margin anteriorly, then curves upwards to the mid-lateral line posteriorly. This pattern is specific to the genus.
Habitat
- Water type
- saltwater
- Depth
- Typically found in coastal waters, estuaries, and continental shelves, ranging from surface to depths of about 100 meters.
- Environment
- Pelagic and benthopelagic, often found over muddy bottoms. Inhabits turbid coastal waters and estuaries.
- Geographic range
- Indo-West Pacific: widespread from the Persian Gulf and Arabian Sea to India, Southeast Asia, and extending to Japan and Australia.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to size, specialized needs, and predatory nature.
- Temperature: 22-28°C
- pH level: 7.8-8.4
- Hardness: Not applicable (marine species)
- Compatibility: Not compatible with other fish in an aquarium setting due to its predatory nature and size.
- Special requirements: Requires extremely large, specialized public aquarium exhibits with strong filtration and a constant supply of live or fresh dead fish prey. Not recommended for private aquarists.
Wild Information
- Conservation status: least concern
- Seasonality: Available year-round in many parts of its range, with peak catches often coinciding with specific fishing seasons or migratory patterns.
- Market price: Variable, depends on region and catch size. Generally moderate to high.
- Commercial importance: medium
- Taste: Mild, slightly sweet
- Texture: Flaky, tender, white flesh with few bones
- Cooking methods: Frying, Grilling, Baking, Steaming, Curries
- Nutritional value: Good source of protein and Omega-3 fatty acids.
Key Facts
Ribbon-like Predatorbehavior
The Gangetic Scabbardfish is an active, pelagic predator with an exceptionally elongated, ribbon-like body, perfectly adapted for swift movements in the water column.
No Tail Finamazing
Unlike most fish, Eupleurogrammus muticus lacks a distinct caudal (tail) fin, with its body tapering to a whip-like filament, a characteristic feature of its genus.
Silvery Camouflageinteresting
Its brilliant silvery coloration provides excellent camouflage in the open water, making it difficult for both prey and predators to spot.
Sharp-toothed Hunterbehavior
Equipped with formidable, sharp canine teeth, the Gangetic Scabbardfish is an efficient hunter of smaller fish and crustaceans.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: Handle with caution due to its sharp teeth, which can inflict painful bites. Use gloves or a fish gripper when handling to avoid injury. No venomous spines are present.
Similar Species
Largehead Hairtail
Trichiurus lepturus
Trichiurus lepturus has a larger head relative to its body, and its lateral line runs straight along the mid-lateral line of the body, unlike the ventrally curved anterior portion in Eupleurogrammus muticus. Also, the dorsal fin origin is typically further back in T. lepturus.
Shortfin Hairtail
Eupleurogrammus glossodon
Eupleurogrammus glossodon is very similar but can be distinguished by subtle differences in dorsal fin ray counts (typically fewer in E. glossodon, 90-98 vs. 100-108 in E. muticus) and sometimes by the relative length of the pectoral fin. E. muticus generally has a slightly longer pectoral fin.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Scombriformes
- Family
- Trichiuridae
- Genus
- Eupleurogrammus
- Species
- muticus
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