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Decapterus tabl, commonly known as the Redtail scad, is a pelagic schooling fish belonging to the family Carangidae. It is characterized by its elongated, fusiform body and distinctive reddish caudal fin. This species is an important component of various marine ecosystems, serving as both predator and prey, and holds significant commercial value in many regions.
Physical Characteristics
- Body shape
- torpedo
- Coloration
- Dorsal surface metallic blue to blue-green, fading to silvery white on the flanks and belly. The most distinguishing feature is the bright reddish caudal fin. A small, distinct black spot is present on the upper margin of the operculum.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Elongated, fusiform body, slightly compressed., Adipose eyelid well developed, covering most of the eye except for a central slit., Lateral line with a distinct anterior arch, becoming straight posteriorly., Scutes present along the straight posterior part of the lateral line, typically 30-40., Terminal mouth., Bright reddish caudal fin.
- Dorsal fin
- Two dorsal fins; the first with 8 spines, the second with 1 spine and 29-33 soft rays, followed by a finlet of 1 spine and 1 ray.
- Tail fin
- Deeply forked, bright red.
- Pectoral fin
- Long and falcate, reaching beyond the origin of the second dorsal fin.
- Distinctive fins
- Anal fin with 2 detached spines anteriorly, followed by 1 spine and 25-28 soft rays, and then a finlet of 1 spine and 1 ray. Pelvic fins small.
Identification Tips
Caudal Fin Color
The most reliable identifier is the distinct bright red coloration of the caudal (tail) fin.
Finlets
Presence of a single dorsal finlet and a single anal finlet posterior to the main dorsal and anal fins, respectively.
Lateral Line Scutes
Count the scutes (hardened scales) along the straight posterior part of the lateral line; Decapterus tabl typically has 30-40.
Opercular Spot
Look for a small, distinct black spot on the upper margin of the operculum (gill cover).
Body Shape
Its elongated, torpedo-like body is characteristic of the Decapterus genus.
Habitat
- Water type
- saltwater
- Depth
- Typically found in coastal pelagic waters, from the surface down to depths of approximately 200 meters (650 feet), though more commonly in the upper 100 meters.
- Environment
- Neritic pelagic, often associated with continental shelves and islands. Forms large schools, particularly near reefs, rocky outcrops, and offshore banks. Can be found in both clear oceanic waters and more turbid coastal areas.
- Geographic range
- Widespread in the Indo-Pacific region, from the Red Sea and East Africa eastward to the Hawaiian Islands and French Polynesia, northward to Japan, and southward to Australia. Also found in the eastern Pacific from Baja California to Peru.
Aquarium Information
- Care level: expert
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: Not suitable for typical home aquaria due to size and schooling behavior; requires very large public aquarium exhibits.
- Temperature: 22-28°C (72-82°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Compatible with other large, fast-swimming pelagic species in very large, specialized exhibits. Not suitable for mixed reef or community tanks.
- Special requirements: Requires extremely large, open-ocean-like environments with strong currents and ample swimming space. Schooling behavior necessitates multiple individuals. Diet must consist of high-quality, varied marine proteins.
Wild Information
- Conservation status: least concern
- Seasonality: Availability can vary seasonally depending on migratory patterns and local fishing regulations, but generally available year-round in tropical and subtropical waters.
- Market price: Varies significantly by region and market demand, often sold fresh, frozen, or processed into fishmeal.
- Commercial importance: high
- Taste: Mild, slightly oily, with a distinct fish flavor.
- Texture: Firm, flaky.
- Cooking methods: Grilling, Frying, Baking, Smoking, Used in fish curries and stews
- Nutritional value: Good source of protein, Omega-3 fatty acids, and various vitamins and minerals.
Key Facts
Schooling Behaviorbehavior
Redtail scads form large, dense schools, often numbering in the thousands, which is a key survival strategy against predators and aids in foraging efficiency.
Important Forage Fishinteresting
They are a crucial link in the marine food web, serving as a primary food source for larger predatory fish, marine mammals, and seabirds.
Fast Swimmersbehavior
Their torpedo-shaped body and deeply forked caudal fin are adaptations for fast, sustained swimming, allowing them to navigate strong currents and evade predators.
Global Distributionamazing
Decapterus tabl has one of the widest distributions among the Decapterus species, spanning vast areas of the Indo-Pacific and eastern Pacific oceans.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions beyond standard fish handling. Care should be taken with sharp fin spines, as with any fish, to avoid minor punctures.
Similar Species
Mackerel scad
Decapterus macarellus
D. macarellus typically has a more greenish or bluish caudal fin, lacking the prominent red coloration of D. tabl. It also tends to have fewer scutes on the lateral line (24-39) and a slightly more slender body.
Shortfin scad
Decapterus macrosoma
D. macrosoma has a shorter pectoral fin that does not extend beyond the origin of the second dorsal fin, unlike D. tabl. Its caudal fin is typically yellowish or dusky, not bright red.
Japanese scad
Decapterus maruadsi
D. maruadsi generally has a more yellowish caudal fin and a more pronounced black spot on the operculum. The number of scutes can overlap, but the caudal fin color is a key differentiator.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Carangiformes
- Family
- Carangidae
- Genus
- Decapterus
- Species
- D. tabl
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