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encylopaedia
crustaceans

Freshwater Crayfish Freshwater Crayfish
Astacus pallipes
Length up to 40mm

Formerly common and widespread but rather scarce and endangered today; numbers threatened by pollution and disturbance of favoured river and stream habitats and by competition from introduced N American species. Needs fast-flowing, well-oxygenated water and, during daytime, hides under stones and in holes in bank.
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