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WillomitzerJ J.: Seasonal Dynamics of Parasitoses in Grasscarp (Utenopharyn­ godon idella) Fry and Fingerlings. Acta vet. Brno, 49, 1980: 269 - 277. Examination of grasscarp (Ctenopharyngodon idella) fry and fingerlings from the State Fishery, Pohorelice, for 3 years revealed grasscarp infestation with 12 parasi­ te genera or species. The intensity and extensity of infestation was highest in the period August to October. The parasites involved were Chilodonella cyprini, Tri­ chodinella sp. and Trichodina domerguei f. magna, which were found from 1 week after hatching, and Diplostomum sp., Ichthyophthirius multifiliis, Dactylogyrus sp., Diplozoon paradoxum, Cryptobia branchialis, Eimeria sp., Piscicola geometra and Nematoda sp., which were demonstrated in grasscarp fingerlings. Moreover, there were a few findings of Cysticercus Gryporhynchus cheilancristrotus which confirmed a previous observation. Age-dependence of the intensity and extensity of infestation was apparent particularly in Diplostomum metacercariae where the rate of infection was' 100 % from 9 weeks of age and the number of parasites per host rose with advancing age from 1.4 at 3 weeks to 34.7 at 16 weeks. The intensity and extensity of Diplostomum metacercariae infection in grasscarp was related to the intensity and extensity of infestation with Diplostomum cercariae in intermediate host snails. Intensity and extensity of infestation, Cryptobia branchialis, Eimeria sp., Chilodonella cyprini, Lchthyophthirius multifiliis, Trichodina domerguei f. magna, Trichodinella sp., Dactylogyrus sp., Diplozoon paradoxum, Cysticercus Gryporhynchus cheilancristrotus Diplostomum sp., Nematoda sp., Piscicola geometra. A considerable rise in the production of herbivorous fish will probably be one of the tasks facing state fisheries in the next five-year-plans in Czechoslovakia. A prerequisite for this is the intro­ duction of artificial spawning. The role which herbivorous fish play in the production of animal

Seasonal Dynamics of Parasitoses in Grasscarp (Ctenopharyngodon idella) Fry and Fingerlings