Revision summary
Oil pollution is crude or fuel oil released into the sea from tankers, wells, ships and ports. It blocks light, kills plankton and larvae, smothers mangroves and coral, and poisons birds and mammals. India’s risk is a long inhabited coast, Gulf-to-Asia tanker traffic, and offshore fields next to ports. Small-scale fishers have little buffer when a landing centre closes. The Indian Coast Guard runs the National Oil Spill Disaster Contingency Plan; prevention is cheaper than cleanup.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
Oil pollution is the release of crude or refined petroleum into the sea, estuary, or coast in amounts that harm life and livelihood. It comes from tanker accidents, offshore wells, ship operations, ports, and pipeline leaks. For India it sits on a long coastline, a busy tanker lane, and millions of fishers.
Body
What oil pollution is
- A slick of crude or fuel oil on the surface; dissolved fractions in the water column; tar balls on beaches; and chronic low-level discharge from shipping and ports.
- Large events are tanker wrecks and blowouts; the daily load is often bilge, bunkering and port runoff.
Impacts on the marine ecosystem
- Surface oil blocks light and gas exchange; it coats plankton, which are the base of the food web.
- Fish eggs and larvae in the upper water die or deform; adult stocks fall after a lag.
- Mangroves, salt marsh and coral smother; recovery takes years because oil sticks to sediment.
- Birds and marine mammals lose insulation and ingest oil while preening.
- Microbial breakdown raises biochemical oxygen demand and can create local hypoxia.
- Persistent polycyclic aromatic hydrocarbons cause long-term toxicity and taint seafood.
Why particularly harmful for India
- India has about 7,500 km of mainland and island coastline and a large Exclusive Economic Zone in a crowded Indian Ocean tanker route from the Gulf to East Asia.
- Mumbai High and other offshore fields, plus major ports (Mumbai, Kandla, Chennai, Visakhapatnam, Kochi), concentrate spill risk next to dense coasts.
- Sundarbans, Gulf of Mannar, Palk Bay, Gulf of Kachchh and Kerala backwaters combine high biodiversity with fishing and salt-making.
- A very large small-scale fishery has almost no buffer if a slick closes a landing centre for weeks.
- Monsoon winds and currents can beach oil on densely inhabited strands quickly.
- The National Oil Spill Disaster Contingency Plan, with the Indian Coast Guard as central coordinating authority, is the response frame; prevention at ports and tankers remains the cheaper defence.
Flow diagram
Conclusion
Oil pollution is petroleum in the sea at harmful levels. It smothers plankton, fish nursery grounds, mangroves, coral and birds. India is exposed because of its tanker lane, offshore oil, long inhabited coast and fisher dependence. Coast Guard contingency plans must sit with port and shipping discipline.
Quick related
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Next question on this syllabus topic (2023 · Q15). View answer →
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Is a tanker wreck the only oil pollution?
No. Chronic bilge, bunkering and port leaks often add more oil over a year than one famous wreck.
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Why are mangroves slow to recover?
Oil sticks to roots and mud. Trees die, and the nursery function for fish is lost for years.
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