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Decapterus russelli, commonly known as the Indian Scad, is a pelagic schooling fish belonging to the family Carangidae. It is a commercially important species throughout its range, known for its streamlined body and fast swimming capabilities. It forms large schools, often near coastal areas and islands, feeding on zooplankton and small invertebrates.
Physical Characteristics
- Body shape
- torpedo
- Coloration
- Dorsal side metallic blue to blue-green, fading to silvery white on the flanks and belly. A distinct black spot is usually present on the upper operculum near the shoulder.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Elongated, fusiform body., Adipose eyelid well developed, covering most of eye except for a vertical 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., A detached finlet posterior to the dorsal and anal fins.
- Dorsal fin
- Two dorsal fins; the first with 8 spines, the second with 1 spine and 29-33 soft rays, followed by a single detached finlet.
- Tail fin
- Deeply forked caudal fin.
- Pectoral fin
- Short pectoral fins, typically 1.5-1.8 times in head length.
- Distinctive fins
- Anal fin with 2 detached spines anteriorly, followed by 1 spine and 24-27 soft rays, and a single detached finlet.
Identification Tips
Body Shape
Look for a sleek, torpedo-shaped body, characteristic of fast-swimming pelagic fish.
Coloration
Note the metallic blue-green dorsal side and silvery belly, with a prominent black spot on the operculum.
Finlets
The presence of a single detached finlet behind both the dorsal and anal fins is a key characteristic of Decapterus species.
Pectoral Fin Length
The relatively short pectoral fin, not reaching the origin of the second dorsal fin, helps distinguish it from some other Decapterus species.
Lateral Line Scutes
Count the number of scutes (hard, bony plates) along the straight posterior part of the lateral line; D. russelli typically has 30-40.
Habitat
- Water type
- saltwater
- Depth
- Typically found in coastal waters from the surface down to about 100 meters, occasionally deeper.
- Environment
- Pelagic-neritic, schooling species found over continental shelves and around oceanic islands. Prefers clear to slightly turbid waters.
- Geographic range
- Indo-Pacific: Red Sea and East Africa to the Philippines, north to southern Japan, south to northern Australia. Also reported from the eastern Mediterranean via the Suez Canal (Lessepsian migrant).
Aquarium Information
- Care level: expert
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to size and schooling behavior.
- Temperature: 24-28°C (75-82°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Not suitable for mixed reef or community tanks. Best kept in very large, species-specific public aquaria.
- Special requirements: Requires immense swimming space, strong filtration, and a constant supply of live or frozen planktonic foods. Highly sensitive to water quality fluctuations.
Wild Information
- Conservation status: least concern
- Seasonality: Available year-round in many parts of its range, with peak catches often coinciding with specific monsoon seasons or upwelling events.
- Market price: Varies significantly by region and season, generally moderate.
- Commercial importance: high
- Taste: Mild, slightly oily, with a distinct fish flavor.
- Texture: Firm, flaky.
- Cooking methods: frying, grilling, baking, steaming, curries
- Nutritional value: Good source of protein, Omega-3 fatty acids, and essential vitamins and minerals.
Key Facts
Schooling Behaviorbehavior
Indian Scad forms large, dense schools, which is a common anti-predator strategy and aids in foraging efficiency.
Lessepsian Migrantinteresting
This species has successfully migrated from the Red Sea into the Mediterranean Sea via the Suez Canal, becoming an established part of the Mediterranean ichthyofauna.
Commercial Importanceinteresting
It is a significant component of artisanal and commercial fisheries throughout its range, often caught using purse seines, trawls, and gillnets.
Dietary Flexibilitybehavior
While primarily zooplanktivorous, Indian Scad can adapt its diet to include small benthic invertebrates and larval fish depending on availability.
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 spines and slippery surfaces. The opercular spine can be sharp, so care should be taken.
Similar Species
Round Scad
Decapterus punctatus
D. punctatus has a longer pectoral fin, typically reaching beyond the origin of the second dorsal fin, and generally fewer lateral line scutes (24-40, but often fewer than D. russelli's typical range).
Mackerel Scad
Decapterus macarellus
D. macarellus has a more slender body, a longer pectoral fin, and a higher number of soft rays in the second dorsal fin (33-38 vs. 29-33 in D. russelli).
Redtail Scad
Decapterus tabl
D. tabl typically has a reddish caudal fin and a longer pectoral fin, often reaching the origin of the second dorsal fin. It also has a slightly different count of lateral line scutes and fin rays.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Carangiformes
- Family
- Carangidae
- Genus
- Decapterus
- Species
- D. russelli
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