The U.K. Environment Agency says cleaner rivers in England and Wales have helped many species of wildlife, the BBC reported last week.

Record numbers of salmon and sea trout have been seen in the Mersey, Tyne and Thames Rivers while otters have returned to their former habitats in every region of England and Wales, scientists say.

"The last decade shows how far we've come in reducing pollution and improving water quality and river habitats," Ian Barker, head of water at the Environment Agency, said.

Incidents of serious water pollution have reduced by half since 2001, he said.

"But there are still big challenges," he said. "Pollution from fields and roads needs to be tackled and the Environment Agency has plans in place to revitalize 9,500 miles of waterways between now and 2015."

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