Ganges River Sprat

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Corica soborna

Also known as: Corica, Soborna

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Description

Corica soborna, commonly known as the Ganges River Sprat, is a small, schooling freshwater fish belonging to the family Clupeidae. It is characterized by its slender, compressed body and silvery coloration. This species is an important component of the freshwater fish fauna in its native range and plays a role in local fisheries.

Physical Characteristics

Body shape: elongated
Coloration: Overall silvery, often with a faint golden or yellowish tint on the back. The sides are bright silvery, and the belly is whitish. Fins are hyaline (transparent).
Scale type: cycloid
Mouth position: superior
Distinctive features: Small size, typically not exceeding 5 cm standard length., Slender and compressed body., Absence of a lateral line., A series of small, sharp scutes (keeled scales) along the belly, though less prominent than in some other clupeids.
Dorsal fin: Single, short-based dorsal fin located mid-body, typically with 10-12 soft rays.
Tail fin: Deeply forked caudal fin.
Pectoral fin: Small, low-set pectoral fins.
Distinctive fins: Pelvic fins are small and located abdominally, anterior to the dorsal fin origin. Anal fin is relatively long, originating behind the dorsal fin, with 15-19 soft rays.

Identification Tips

Size and Shape

Look for a very small (usually under 5 cm), slender, and laterally compressed fish with a silvery body.

Mouth Position

The mouth is superior (upturned), indicating its surface-feeding habit.

Fin Placement

The dorsal fin is located roughly in the middle of the body, and the anal fin is relatively long, starting behind the dorsal fin.

Absence of Lateral Line

Unlike many fish, Corica soborna lacks a distinct lateral line, which can be a key identifier.

Habitat

Water type: freshwater
Depth: Surface to mid-water column, typically in shallow to moderately deep areas of rivers and estuaries.
Environment: Primarily found in large freshwater rivers, estuaries, and associated floodplains. Prefers clear to slightly turbid waters with moderate to strong currents. Also found in beels (oxbow lakes) and canals connected to major river systems.
Geographic range: Native to South Asia, specifically the Ganges-Brahmaputra river system in India and Bangladesh. Also reported from Myanmar and Thailand, though its distribution in Southeast Asia may involve closely related species or subspecies.

Aquarium Information

Care level: advanced
Temperament: peaceful
Diet: filter_feeder
Minimum tank size: 75 gallons
Temperature: 22-28°C (72-82°F)
pH level: 6.5-7.5
Hardness: 5-15 dGH
Compatibility: Best kept in large schools (20+ individuals) with other peaceful, similarly sized freshwater fish. Avoid aggressive or fin-nipping species.
Special requirements: Requires a well-established aquarium with excellent filtration and strong water flow to simulate its natural riverine habitat. A fine sand substrate and open swimming areas are preferred. Sensitive to poor water quality.

Wild Information

Conservation status: least concern
Seasonality: Peak abundance often observed during post-monsoon periods when water levels are receding and fish are more concentrated.
Market price: Low (primarily local consumption)
Commercial importance: medium
Taste: Mild, slightly oily
Texture: Soft, delicate
Cooking methods: Fried, Curried, Dried
Nutritional value: Good source of protein and omega-3 fatty acids.

Key Facts

Schooling Behaviorbehavior

Corica soborna is a highly schooling species, forming dense aggregations, especially in open water. This behavior provides protection from predators and aids in foraging.

Ecological Roleinteresting

As a small, abundant planktivore, it serves as a crucial forage fish, forming a vital link in the food web for larger predatory fish and piscivorous birds in its ecosystem.

Local Fishery Importanceinteresting

Despite its small size, it is an important component of artisanal and subsistence fisheries in its native range, often caught in large quantities for local consumption and sometimes for fishmeal.

Taxonomic Clarityevolution

The genus Corica has historically been subject to some taxonomic confusion, with C. soborna and C. laciniata being the two recognized species, often requiring careful morphological analysis for accurate identification.

Safety Information

Safe

Safety level: safe
Venomous: No
Edibility: edible
Handling notes: No specific handling precautions are required. They are small and harmless. Care should be taken to avoid injury to the fish due to their delicate nature if handled.

Similar Species

Corica laciniata

C. laciniata typically has a slightly deeper body and a more pronounced series of ventral scutes. Morphometric and meristic counts (e.g., fin ray counts, vertebral counts) are often required for definitive differentiation, as external differences can be subtle.

Other small clupeids

Various species

Many small clupeids share a silvery, compressed body. C. soborna can be distinguished by its very small size, superior mouth, and specific fin ray counts. Detailed examination of gill rakers and ventral scutes is often necessary to separate it from other genera like Gudusia or Tenualosa juveniles.

Scientific Classification

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Clupeiformes
Family: Clupeidae
Genus: Corica
Species: soborna

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