Archive · 7 Nov 2025
Oil and Oxygen Depletion Caused Gorakhpur Fish Kill
Imagine a pond where lots of fish live.
During festivals, people put oil, flowers, and food into the pond as offerings.
This made a layer on top of the water, like a blanket, that stopped air from getting in.
The fish needed air to breathe, but they couldn't get enough.
Also, the oil made the water yucky.
This made the fish sick and many of them died.
Scientists took some water and found too much oil and not enough air.
They think this is why so many fish died.
Now, people want to make sure no one throws things in the pond anymore so the fish can be safe.
Mass fish deaths in Gorakhpur's Surajkund pond were caused by oil contamination and oxygen depletion.
Analysis revealed high levels of oil and organic pollution after Diwali and Chhath festivals.
Ritual offerings like oil and flowers formed a surface layer, blocking essential oxygen transfer.
Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) indicated significant water pollution.
Experts termed the event 'oxygen shock and oil poisoning', prompting calls for stricter ecological safeguards.
- Who
- Fish in Surajkund pond, residents, Heritage Foundation, Narayan Laboratory and Consultancy, Deen Dayal Upadhyay University's Industrial Microbiology department
- What
- Mass fish deaths attributed to oil contamination and oxygen depletion.
- When
- Last month (around October 29th and subsequent days after festivals)
- Where
- Surajkund pond, Gorakhpur Industrial Development Authority (GIDA) area
- Why
- Discharge of oil, ghee, flowers, and other ritual offerings into the pond during festivals blocked oxygen transfer and contaminated the water.
Heritage Foundation
Lab Findings
Cause of Fish Deaths
Heritage Foundation
Urged local authorities to enforce ecological safeguards and restrict dumping of ritual offerings and waste into public water bodies, implying a need for action against pollution sources.
Lab Findings
Analysis indicated oil contamination and severe oxygen depletion due to festivals caused the mass fish deaths.
- Location
- Surajkund pond, Gorakhpur
- Cause
- Oil contamination and severe oxygen depletion
- Contributing Factors
- Oil, ghee, flowers, and other ritual offerings released into the pond during festivals
- Lab Conducting Analysis
- Narayan Laboratory and Consultancy
- Biochemical Oxygen Demand (BOD)
- 4.5 mg/L
- Chemical Oxygen Demand (COD)
- 120 mg/L
- Oil and Grease Levels
- Nearly four times the permissible limit