Fish Welfare in Rivers and Pollution Events

River pollution events from agricultural run-off, sewage spills, and industrial accidents cause acute welfare harm to fish populations through deoxygenation and toxic exposure.

Key Facts

Sewage treatment works in England discharged raw sewage for millions of hours in 2022
Agricultural run-off including slurry and pesticides causes fish kills annually
Deoxygenation from sewage and algal blooms causes fish to suffocate at the surface
Some pollution events kill fish populations in entire river catchments
The Environment Agency investigates pollution incidents causing fish kills

Welfare Considerations

Fish caught in pollution events experience suffocation from low oxygen, chemical burns from toxic substances, and osmotic stress from altered water chemistry. Death is often slow and distressing for thousands to millions of individual fish in major incidents. Prevention through enforcement of pollution regulations, holding polluters accountable, and investment in sewage infrastructure is the welfare-priority intervention. Reporting suspected pollution immediately enables faster regulatory response.

What You Can Do

Report suspected river pollution to the Environment Agency 24-hour hotline 0800 80 70 60
Support campaigns for Water Companies to invest in sewage overflow reduction
Advocate for stronger Environment Agency enforcement powers and resources
Engage with river quality campaigns and monitoring organisations
Reduce agricultural run-off through support for appropriate farming practices