A PLAN OF RESTORATION IN NAVARRA FOR THE NATIVE FRESHWATER CRAYFISH SPECIES OF SPAIN, AUSTROPOTAMOBIUS-PALLIPES

This paper describes the attempts to protect and re-establish threaten ed populations of the native freshwater crayfish, Austropotamobius pal lipes, of Navarra, Spain. Three species of crayfish are presently thri ving in Navarra, the native species A. pallipes and the introduced Nor th American species Pacifastacus leniusculus and Procambarus clarkii. Both species are known to carry the fungus Aphanomyces astaci in their cuticles and to transmite it to the native species. The management st rategies implemented by the authorities in order to restore native pop ulations of crayfish are discussed.