Dermocystidiosis-a gill disease of the carp due to Dermocystidium cyprini n.sp

A new species of Dermocystidium is reported to be the causative agent of three outbreaks of gill disease in carp observed in recent years in Czechoslovakia. No other parasites or influences could be held responsible for the disease. It is suggested that at least some of gill disease of unknown aetiology in carp is due to dermocystidia, and the disease might be distributed in many regions of Europe. A description of a greater part of the developmental cycle of the species D. cyprini n.sp. Cervinka et Lom, is presented, supplemented by a discussion of other species of the genus. A summary of known facts on the host-parasite relation in these parasites is also given.