Welfare of Wild Freshwater Fish in Declining Rivers

Freshwater fish face mounting welfare threats from pollution, abstraction, rising temperatures, and invasive species.

Key Facts

Freshwater fish populations have declined by 76% globally since 1970
River water temperatures in England have risen by 0.5-1 degree Celsius per decade
Atlantic salmon populations are at historic lows in many UK rivers
Microplastic pollution is now found in the intestines of freshwater fish across Europe
Hypoxic events caused by algal blooms kill millions of fish in summer in nutrient-polluted rivers

Welfare Considerations

Wild freshwater fish experience welfare impacts from environmental degradation that are largely invisible because they occur below the water surface. Heat stress, parasitism, hypoxia from pollution, and food scarcity from invertebrate decline all cause genuine suffering. Unlike farmed fish, their suffering cannot be mitigated by management — only by restoring river conditions. Clean water policy, reduced abstraction, and climate action are the key welfare interventions for wild freshwater fish.

What You Can Do

Support the Angling Trust, Rivers Trust, and equivalent bodies campaigning for clean rivers
Report water pollution incidents immediately to the Environment Agency
Reduce agricultural chemical use if you farm or garden near waterways
Advocate for higher environmental flow standards in water abstraction licensing
Support rewetting of floodplain habitats to buffer temperature and flow extremes