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| Indian oil sardine | |
|---|---|
| Name | Indian oil sardine |
| Taxon | Sardinella longiceps |
| Authority | (Valenciennes, 1847) |
| Family | Clupeidae |
| Order | Clupeiformes |
Indian oil sardine is a small pelagic Sardinella longiceps of the family Clupeidae widely harvested in the Indian Ocean region. It is central to coastal fisheries in India, Sri Lanka, Bangladesh, Pakistan and Myanmar and plays a key role in regional food security and marine ecology. The species supports artisanal fleets from ports such as Cochin, Pondicherry, Visakhapatnam and Karwar and figures in studies by institutions including the Central Marine Fisheries Research Institute, the Indian Council of Agricultural Research, and the National Institute of Oceanography.
Sardinella longiceps was described by Achille Valenciennes in 1847 and classified within Clupeiformes, related to genera such as Sardinops, Sardinella, Clupea, Spratelloides and Amblygaster. Common names used in regional languages include references in Malayalam, Tamil, Kannada, Telugu and Marathi, and commercial labels often cite names used in markets such as Mumbai, Chennai, Kolkata and Thiruvananthapuram. Taxonomic treatments by authorities like the World Register of Marine Species and catalogues from the Food and Agriculture Organization reflect morphological and meristic characters distinguishing it from congeners such as Sardinella gibbosa and Sardinella melanura.
Adults are typically 10–18 cm in standard length with a compressed, silvery body, a single dorsal fin and a notable adipose spot near the gill cover, features compared across taxa like Clupea harengus and Sardinops sagax. Identification relies on counts of gill rakers, lateral line scales and cephalic anatomy used by taxonomists at institutions such as the Natural History Museum, London and the Zoological Survey of India. Colouration and morphology are referenced in ichthyological works by Francis Day and diagnostic keys used by the Smithsonian Institution and regional monographs.
The species inhabits coastal and shelf waters of the northern and eastern Arabian Sea, the Bay of Bengal, and parts of the Andaman Sea, occurring from the coasts of South Africa eastwards to Southeast Asia and seasonal appearances near Sri Lanka and Maldives. It frequents neritic zones and estuarine mouths, associating with upwelling regions such as the Saurashtra coast and the Southwest Coast of India during productive seasons documented in studies by the Indian National Centre for Ocean Information Services and the Integrated Coastal and Marine Area Management programmes.
Sardinella longiceps is a filter-feeding planktivore consuming zooplankton taxa like copepods, krill and fish larvae, linking lower trophic levels to predators including tuna, dolphins, seabirds and sharks. Reproductive biology includes batch spawning synchronized with monsoon-driven productivity and oceanographic features such as the Monsoon Current and Upwelling events; research by the Central Marine Fisheries Research Institute and the National Institute of Oceanography details fecundity, gonadosomatic indices and larval development. Population dynamics interact with climatic phenomena like the Indian Ocean Dipole, El Niño–Southern Oscillation, and mesoscale processes studied by the Indian Space Research Organisation and oceanographic observatories along the Konkan coast.
The species supports artisanal and commercial fisheries in ports including Cochin, Mangalore, Calicut, Tuticorin, Chilka Lake and Cachar. Landings contribute to regional protein supply, local markets, canneries and fishmeal industries represented by companies and cooperatives in Kerala, Karnataka, Andhra Pradesh and Tamil Nadu. Economic analyses by agencies like the Food and Agriculture Organization and the Ministry of Fisheries, Animal Husbandry and Dairying highlight its role in livelihoods, export commodities bound for markets such as Middle East and Southeast Asia, and value chains involving cold storage, transportation and processing hubs in metropolitan centres like Mumbai and Kolkata.
Traditional methods include boat seines, stake nets, purse seines and ring seines deployed by artisanal fleets operating from landing centres in Kerala and Karnataka; mechanized trawlers also catch the species in continental shelf waters, regulated by frameworks outlined by the Marine Products Export Development Authority and regional fishery departments. Post-harvest processing comprises drying, salting, canning and conversion to fishmeal with facilities in industrial zones such as Tuticorin and Mangalore; cold-chain logistics connect producers to markets facilitated by agencies including the Export Inspection Council and port authorities at Cochin Port Trust.
Management measures are implemented through national bodies like the Ministry of Fisheries, Animal Husbandry and Dairying, state fisheries departments and research institutions including the CMFRI and the National Bureau of Fish Genetic Resources. Strategies address seasonal closures, mesh-size regulations, licensing of gear, and monitoring programs tied to stock assessments by the Indian Council of Agricultural Research and international guidelines from the Food and Agriculture Organization. Climate-driven variability and stock fluctuations prompt ecosystem-based approaches advocated by organizations such as the World Wide Fund for Nature and regional policy dialogues involving the Bay of Bengal Programme and the Indian Ocean Rim Association.