Abstract

Britain’s only native freshwater crayfish Austropotamobius pallipes was widespread in the rivers of mid-Wales certainly into the 1980s. Since then the species appears to have been in serious decline partly through confirmed outbreaks of crayfish plague, but partly, it is suggested, through other causes. These are thought to include the use of synthetic pyrethroids as sheep dip, overstocking of farmland leading to river bank damage and subsequent silting and the lack of management of riparian trees reducing light input and in consequence reducing primary productivity.

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