No abstract

In Finland, the nationwide strategy for crayfish management in inland waters was renewed in 2000. The main objective was to maintain and increase the stocks of indigenous noble crayfish, Astacus astacus L. In southern Finland many water courses are being chronically infected by crayfish plague. Consequently, the strategy attempts to restore the productivity of crayfish stocks by introducing plague-resistant signal crayfish, Pacifastacus leniusculus Dana.