Les maladies des écrevisses, leur reconnaissance et la surveillance sanitaire des populations astacicoles

Abstract

Diseases are caused in natural and avtificial populations of crayfish by parasitoids protozoan bacteria and fungi The death of the host is often related to the Intervention of favoring factors or provoked by multiple infections The recognition of causes of death is often cornplicated and reouires the participation of a laboratory. The results of experimental investigations have allowed to establish technical sheets and diagnosis protocols making this identification easier This situation is favorable to a rapid application of a sanitary control of crayfish populationz The development of researches on crayfish diseases will be an essential factor for the success of protection of natural populations restoration operations and aquaculture It will also permit a better understanding of pathological aspccts of equilibria in freshwaters