Brown trout adapt to tolerate a river's poisons

Brown trout in the River Hayle have adapted to survive and breed despite lethal toxin levels, a legacy of the Cornish tin mining industry. A joint study by KCL and Exeter University has found that this population of brown trout has undergone rapid genetic changes and developed a tolerance to the toxin levels. This study clearly demonstrates the importance of trout being able to use the full range of genes in their genetic tool box’ and illustrates the dangers of stocking in diluting this resource (see the WTT Stocking page).

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