In Romania, Poland and Croatia, F. limosus was reported to displace native European crayfish species (Pontastacus leptodactylus, Astacus astacus and P. leptodactylus respectively) that led to their disappearance at multiple sites, hence, MR is assigned. Moreover, in the Czech Republic, outbreaks caused by crayfish plague pathogen, Aphanomyces astaci strain transmitted by F. limosus led to local extinction of populations of three native crayfish species, A. astacus, Austropotamobius torrentium and Pontastacus leptodactylus. Transmission of A. astaci by F. limosus was also reported to be responsible for local extinction of A. torrentium and A. pallipes populations in Italy. Since the changes are reversible after removal of F. limosus from the invaded sites, the MR category was assigned.