[Opinions on the ways of reaching the eyeball by cercaria of the Diplostomum genus].

The views on the ways of migration of Diplostomum cercaria from body surface to fish eyeball, among them about the ways of parasites dislocation through the tissues, beginning from the penetration to host body--was presented. The hypothesis on passive in-coming transport of cercaria by the circulatory system of fish was questioned; on the other hand it has been argued active penetration of parasites through tissues, according to the hypothesis of cercaria migration stimulated by the respective concentration of carbonate anhydrasis in host. It has been stated that migrations of cercaria to fish eyeball may be different depending on the penetrations place of parasite on body host.