UDK 619:639.312:616.995.122.22 FAUNA OF MONOGENEAN TREMATODES – PARASITES OF SOME CYPRINID FISHES FROM

During parasitological investigations six species of monogenean trematodes were found on the gills of three cyprinid fish species from Lake Prespa (Macedo-nia), as follows: Dactylogyrus prostae and Dactylogyrus sphyrna in Leuciscus cephalus albus, Dactylogyrus erhardovae, Dactylogyrus sphyrna and Paradiplo-zoon zeller in Rutilus rubilio prespensis and Dactylogyrus elegantis and Dactylogy-rus vistulae in Chondrostoma nasus prespensis. The prevalence in Leuciscus cephalus albus was 62.22%, in Rutilus rubilio prespensis 59.87%, while in Chondrostoma nasus prespensis it was the lowest and amounted to 41.59%. The overall, prevalence of monogeneans in the investi-gated cyprinid fishes from Lake Prespa was 53.65%, and the mean intensity of in-festation was 6.08. Among the monogenean species the highest prevalence occurred with Dactylogyrus sphyrna (25.08%), and the greatest intensity of infesta-tion was evident in the cases of infestation with Dactylogyrus erhardovae (12.87). The greatest pathological effect was associated with the monogeneans Dactylogy-rus vistulae and Paradiplozoon zeller. All monogenean species found represented the first record for such parasite fauna of fishes in Macedonia. Key words: Monogenean trematode, cyprinid fish, Lake Presp