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Kuhlia mugil, commonly known as the Barred Flagtail, is a species of ray-finned fish belonging to the family Kuhliidae. It is a small to medium-sized fish characterized by its silvery body and distinctive dark bars on its caudal fin. These fish are often found in coastal marine and brackish waters, and occasionally venture into freshwater, demonstrating a euryhaline nature. They are active, schooling fish that play an ecological role as both predator and prey in their respective habitats.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Silvery body, often with a darker dorsal surface and lighter ventral side. The most distinguishing feature is the caudal fin, which has 5-7 prominent dark bars or stripes.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- 5-7 dark bars on the caudal fin, Silvery body coloration, Large eyes, Forked caudal fin
- Dorsal fin
- Single dorsal fin, deeply notched, with 10 spines followed by 10-12 soft rays.
- Tail fin
- Deeply forked caudal fin with 5-7 prominent dark bars.
- Pectoral fin
- Moderately sized, clear to slightly dusky.
- Distinctive fins
- The deeply forked caudal fin with its characteristic dark bars is the primary diagnostic feature.
Identification Tips
Caudal Fin Bars
Count the distinct dark bars on the caudal (tail) fin. Kuhlia mugil typically has 5-7 bars, which is a key differentiator from other Kuhlia species.
Body Coloration
Observe the overall silvery body color, which can sometimes have a faint yellowish or greenish tint dorsally.
Dorsal Fin
Note the deeply notched dorsal fin, characteristic of the Kuhliidae family.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters, from the surface down to about 20 meters (65 feet).
- Environment
- Coastal reefs, rocky shores, estuaries, mangrove areas, and occasionally freshwater streams and rivers. They prefer areas with good water movement and cover.
- Geographic range
- Indo-Pacific region, from East Africa to the Hawaiian Islands, north to southern Japan, and south to Australia and Lord Howe Island.
Aquarium Information
- Care level: intermediate
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 150 gallons (570 liters)
- Temperature: 72-78°F (22-26°C)
- pH level: 7.8-8.4
- Hardness: 8-12 dKH
- Compatibility: Can be kept with other robust, similarly sized fish. Avoid very small or overly aggressive tank mates. Best kept in groups of 3 or more to diffuse aggression.
- Special requirements: Requires a well-filtered tank with plenty of swimming space and some rockwork for shelter. Can be kept in marine or brackish setups, and can tolerate freshwater for periods, but long-term freshwater keeping is not recommended. A varied diet of meaty foods is essential.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for availability; present year-round in suitable habitats.
- Market price: Low to moderate, primarily for bait or local consumption in some regions.
- Commercial importance: low
- Taste: Mild, slightly sweet
- Texture: Flaky, white meat
- Cooking methods: fried, baked, grilled, steamed
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Euryhaline Naturebehavior
Kuhlia mugil is highly euryhaline, meaning it can tolerate a wide range of salinities, from full marine to brackish and even freshwater environments.
Schooling Behaviorbehavior
These fish are typically found in schools, especially when juveniles, providing safety in numbers against predators.
Nocturnal Foragersbehavior
While active during the day, Barred Flagtails are known to be more active foragers during twilight and nighttime hours.
Indicator Speciesinteresting
Their presence in estuaries and coastal rivers can sometimes indicate good water quality, as they are sensitive to pollution.
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. They are not venomous.
Similar Species
Spotted Flagtail
Kuhlia rupestris
Kuhlia rupestris has a more robust body, often with dark spots or blotches on its body and fins, and lacks the distinct vertical bars on the caudal fin that are characteristic of K. mugil. K. rupestris also tends to be found further upstream in freshwater environments.
Silver Flagtail
Kuhlia taeniura
Kuhlia taeniura also has dark bars on its caudal fin, but typically only 3-5, and they are often less distinct or more diffuse than those of K. mugil. K. taeniura also tends to have a more elongated body shape.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Centrarchiformes
- Family
- Kuhliidae
- Genus
- Kuhlia
- Species
- Kuhlia mugil
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