Coasts and shelves
Shallow seas over the continental shelf. 538 fish on EveryFish so far.
The continental shelf is the shallow sea bed that fringes the continents, usually less than about 200 metres deep. It covers under a tenth of the ocean, but sunlight and nutrients from rivers and upwelling make it very productive, and most of the world's sea catch comes from it. Coastal seas hold schools of sardines and mackerel near the surface and cod, croakers and flatfish near the bottom.
India's coastal fisheries
India has a long coastline, remeasured in 2024 at more than 11,000 km, and most of its sea catch comes from the shelf. Oil sardine and mackerel dominate on the south-west coast, Bombay duck, pomfret and ribbonfish in the north-west, and hilsa, croakers and prawns in the Bay of Bengal. Small-scale fishers work close to shore, while trawlers and purse seiners fish further out. Mechanised fishing stops for 61 days each year during the monsoon breeding season.
Pressure on the shelf
Because shelf seas are close to land and easy to reach, they are heavily fished. Bottom trawling catches many young fish and disturbs the sea bed. Pollution from rivers, coastal building and the loss of mangroves and sea grass affect nurseries. In many seas, catches have shifted from large, valuable fish to smaller ones as the larger fish have been fished out. Marine protected areas and closed seasons are the main tools used to rebuild stocks.
Famous coasts and shelves fish
Bombay duckCaught in tidal nets off Gujarat and Maharashtra
Largehead hairtailRibbonfish, a major export
European plaiceA flatfish of the North SeaFurther reading
WorldSwordfish
Large migratory fish with a long flat bill, sole member of its family.Other · Coasts and shelves
WorldMackerel
A group of pelagic fish known for their speed, stripes, and role in global fisheries.Tuna · Open ocean
WorldGrouper
Marine ray-finned fish in the family Epinephelidae, known for large size and commercial value.Shark · Coasts and shelves
🇳🇿 New Zealand and 3 moreBlue grenadier
A slender, silvery deep-sea fish from the Southern Hemisphere.Other · Coasts and shelves
WorldBarracuda
Large predatory saltwater fish with sharp teeth found in tropical oceans.Shark · Coasts and shelves · 1758
🇮🇳 India and 1 moreIndian sillago
A small coastal whiting found in India and Oman.Other · Coasts and shelves · 1985
Photo credits on this page
The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.
- Plaice: Hans Hillewaert, CC BY-SA 4.0, source
- Largehead hairtail: Unknown author, CC BY-SA 2.5, source
- Bombay duck: Hamid Badar Osmany (hamid61612002@yahoo.com ), CC BY 3.0, source
- Sturgeon: Duane Raver/U.S. Fish and Wildlife Service, Public domain, source
- Atlantic cod: Wilhelm Thomas Fiege, CC BY-SA 4.0, source
- Mackerel: Jastrow, Public domain, source
- Mahi-mahi: (c) Nick Tobler (Cowturtle), some rights reserved (CC BY), CC BY 4.0, source
- Atlantic herring: zakqaryroy, CC BY 4.0, source
- Grouper: Photo2222, CC BY-SA 3.0, source
- Blue cod: Unknown author, Public domain, source
- Cobia: Jorge Alarcon or Dr. Daniel Benetti, Public domain, source
- Sprat: Hans Hillewaert, CC BY-SA 4.0, source
- Beluga sturgeon: Daniel Döhne, CC BY-SA 3.0, source
- Red drum: Hines, Robert W., Public domain, source
- John Dory: de:Benutzer:Kleines.Opossum, CC BY-SA 3.0, source
- Lumpfish: Steven G. Johnson, CC BY-SA 3.0, source
- Blue grenadier: Unknown author, Public domain, source
- Silver pomfret: Takeaway, CC BY-SA 3.0, source
- Large yellow croaker: Walter Grassroot, CC BY-SA 4.0, source
- Indian oil sardine: Nithin bolar k, CC BY-SA 3.0, source
- Small yellow croaker: 思源如宁, CC BY-SA 3.0, source
- Dorab wolf-herring: Ewout Knoester, CC BY-SA 4.0, source
- Barracuda: Unknown author, Public domain, source
- Indian sillago: Kare, Public domain, source
- Giant mudskipper: Artem Abdukakharov, CC BY 4.0, source
- Swordfish: vtzanatos, CC BY-SA 4.0, source
- Striped bass: Steven G. Johnson, CC BY-SA 3.0, source
- Barramundi: Mitch Ames, CC BY-SA 4.0, source
- Paradise threadfin: George Henry Ford, Public domain, source
- Grey triggerfish: Diego Delso, CC BY-SA 4.0, source
- Black marlin: jamesh111, CC BY 4.0, source
- Indian mackerel: Jean-Lou Justine, CC BY-SA 4.0, source
- Pufferfish: Unknown author, Public domain, source
- Atlantic goliath grouper: Albert kok, CC BY-SA 3.0, source