The trout that like heavy metal

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Contaminated during the surrounding area’s history of mining, the River Hayle in Cornwall contains metals including copper, zinc, nickel and cadmium at levels that can kill brown trout, a particularly sensitive species. It comes as a surprise, then, that brown trout in this river show no obvious signs of toxicity and are apparently flourishing. We set out to investigate how these fish might be able to tolerate such extreme exposure to toxic metals.

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