In a stark warning for biodiversity, a recent report from the Environment Agency predicts that brown trout, celebrated as Britain’s national fish, could face extinction in large parts of England by 2080. With rising water temperatures threatening their survival, this news highlights a pressing environmental concern for both anglers and conservationists alike.
Quick Summary
- A government report forecasts that brown trout may not survive in most English rivers by 2080 due to rising water temperatures.
- Over 70% of river sites could exceed critical temperature thresholds for brown trout eggs.
- Adult trout will face threats from summer temperatures above 19.5°C.
- “The increasing number of sites projected to experience water temperatures above critical ranges for brown trout is of particular concern.”
Background
The brown trout (Salmo trutta), native to Britain for thousands of years, has been a cherished species, even voted as the nation’s favorite fish in a 2016 BBC Springwatch survey. However, new projections indicate that climate change is set to dramatically alter the habitats essential for their survival.

Impact
The Environment Agency’s report outlines that by 2080, the average water temperature in English rivers during the warmest months could rise by approximately 0.6°C each decade. This increase poses a significant threat to the brown trout population, particularly during their critical winter spawning season. The report warns that over 70% of monitored sites may exceed the crucial threshold of 12°C, which is vital for the survival of trout eggs.
Expert Opinions
According to the chief scientist’s group involved in the study, “Adult brown trout will be under threat from high summer water temperatures at almost all sites by 2080.” The report emphasizes that as temperatures rise, not only does it affect the metabolic rates of these fish, but it also increases their vulnerability to pollutants and pathogens.
The report cites an alarming trend: “There is an increase in reports of egg mortality and defects when water temperatures rise above 12°C.” This data underscores the urgency for further research and immediate action to protect this iconic species.

FAQs
Q: What is causing the decline in brown trout populations?
A: Rising water temperatures due to climate change are primarily responsible for the decline.
Q: What can be done to protect brown trout?
A: Conservation efforts focusing on habitat preservation and pollution reduction are crucial.
Conclusion
As we look toward the future, the plight of the brown trout serves as a stark reminder of the impacts of climate change on our ecosystems. The report calls for urgent action and further research to mitigate these effects.