30 June 2014 Last updated at 16:26
A colony of about 100 protected native crayfish is to be moved from a canal to allow the water to be drained during repairs to a nearby weir.
The Environment Agency is moving the native crayfish and fish from the Sea Cut, near Scarborough, North Yorkshire.
Part of the cut, built after a flood in 1799, is to be drained before repairing cracks in Lower Newby weir.
Trout, eels and the endangered white-clawed crayfish are to be returned in August after repairs are finished.
Cages are to be used to catch the crayfish before electricity is used to stun the fish for collection, the agency said.
White-clawed crayfish are Britain's only native freshwater crayfish and are protected by the Wildlife and Countryside Act of 1981.
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