Around 40 per cent of the remaining native white-clawed crayfish population in England could be wiped out in a year

Crayfish plague has been identified in the River Allen in Dorset, one of just four areas in the south west which still have natural populations of the white-clawed crayfish, which are native to the UK.

“This was one of the strongest and healthiest populations we had left,” said Mr Allen. “But they are very rare, the white clawed crayfish are on the globally endangered list.”

http://www.telegraph.co.uk/earth/earthnews/11021889/Native-crayfish-in-danger-as-deadly-plague-identified-in-strongest-southern-habitat.html