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Page last updated at 10:50 GMT, Thursday, 10 September 2009 11:50 UK
The East's crayfish fight back

The white-clawed crayfish is being threatened by an American intruder

The East of England's white-clawed crayfish are being moved from the River Wensum in Norfolk to a secret location in Suffolk to increase numbers.

The species has been in rapid decline since the larger American signal crayfish was introduced in the 1950s.

The American variety are twice the size of the white-claw and more aggressive.

"Since the 1970s they have been disappearing from one river system after another," said Julia Stansfield from the Environment Agency.

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