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31 December 2010
Last updated at 03:05 ET
An improvement in water quality in UK rivers has boosted many species of wildlife, the Environment Agency said.
The last decade has been the best for rivers since the industrial revolution, it said.
Record numbers of salmon and sea trout were found in the Mersey, Tyne and Thames, while otters returned to every region in England and Wales.
The decade also saw the return of the water vole after a dramatic decline in the 1990s.
Incidents of serious water pollution have more than halved since 2001.
The River Thames won the International Theiss River Prize for outstanding achievement in river management and restoration earlier this year.
Ian Barker, head of water at the Environment Agency, said: "The last decade shows how far we've come in reducing pollution and improving water quality and river habitats.
"Rivers in England and Wales are at their healthiest for over a century, with otters, salmon and other wildlife returning to many rivers in record numbers in locations across the country."
He added: "But there are still big challenges. Pollution from fields and roads needs to be tackled and the Environment Agency has plans in place to re-vitalise 9,500 miles of waterways between now and 2015."
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The last decade has been the best for rivers since the industrial revolution, it said.
Record numbers of salmon and sea trout were found in the Mersey, Tyne and Thames, while otters returned to every region in England and Wales.
The decade also saw the return of the water vole after a dramatic decline in the 1990s.
Incidents of serious water pollution have more than halved since 2001.
The River Thames won the International Theiss River Prize for outstanding achievement in river management and restoration earlier this year.
Ian Barker, head of water at the Environment Agency, said: "The last decade shows how far we've come in reducing pollution and improving water quality and river habitats.
"Rivers in England and Wales are at their healthiest for over a century, with otters, salmon and other wildlife returning to many rivers in record numbers in locations across the country."
He added: "But there are still big challenges. Pollution from fields and roads needs to be tackled and the Environment Agency has plans in place to re-vitalise 9,500 miles of waterways between now and 2015."
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