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The carrier status and possible elevated tolerance of the signal crayfish(Pacifastacus leniusculus) against the crayfish plague disease agent(Aphanomyces astaci) has been speculated for several decades. Westudied experimentally the responses of the signal crayfish from two Finnish populationsagainst the crayfish plague infection by using two crayfish plague isolates with differingvirulences; the highly virulent PsI-isolate and the mid virulent As-isolate. The studiedsignal crayfish came from two origins: the wild Leppävirta population and the Raukolafarmed population of mixed genetic background. Both test groups were infected withA. astaci isolates using the challenge of 10 000 sporesmL-1. Theisolates were PsI-Puujärvi (UEF8866-2) from Lake Puujärvi signal crayfish (year 2003) andAs-Kivesjärvi (Evira6462/06) from Lake Kivesjärvi noble crayfish (year 2005 epidemic) inFinland. The crayfish were sampled prior to the experimental challenge with A.astaci to evaluate their A. astaci carrier status. Themortality, molting, feeding activity and other behavior of the crayfish were followedduring the experiment. We observed increased mortality of the infected groups, related tothe molting in some cases, and delayed molting. The impacts of the intense crayfish plagueinfection on the signal crayfish were clear and the studied populations showed differencesin their reactions that are potentially explained by differing physiological conditionsand different molt cycle phase. The results show that infection of both tested crayfishplague genotypes affects signal crayfish and is likely one of the main reasons behindlosses among signal crayfish populations

The signal crayfish is vulnerable to both the As and the PsI-isolates of the crayfish plague