抄録
Dactylogyroses have been known in carp culture in Japan, but the causative agents have never been studied taxonomically.
In the spring of 1975, a dactylogyrosis occurred in carp ponds of Hiroshima Prefectural Freshwater Fish Experiment Station and some other private farms in the same prefecture.
Fish from these ponds were infected with a numerous number of a dactylogyrid on the gills, and in a serious case, more than 450 monogenean individuals were observed on 4 gill-arches of one fish.
As a result of examinations of both live and stained specimens of the dactylogyrid, the monogenean parasite was identified as Dactylogyrus extensus MUELLER and VAN CLBAVE 1932.
