Monogenean Trematods - Parasites Of Some Cyprinid Fishes From Lakes Ohrid And Prespa (Macedonia)

During parasitological investigations of the gills of 3 cyprinid species from lakes from the Adriatic river basin of Macedonia (Lake Ohrid and Lake Prespa), 7 monogenean species were found: in Chondrostoma nasus we found: Dactylogyrus elegantis, D. vistulae and Paradiplozoon homoion homoion, in Alburnus alburnus we found Dactylogyrus alatus f. typica, Dactylogyrus minor, Diplozoon paradoxum and Paradiplozoon alburni, in Alburnoides bipunctatus we found Dactylogyrus alatus f. typica and Paradiplozoon alburni. Prevalence in Chondrostoma nasus ohridanus is 50,0%, in Chondrostoma nasus prespensis is 41,59% (in total Chondrostoma nasus - 41,88%), in Alburnus alburnus ohridanus is 47,75%, in Alburnus alburnus prespensis is 41,38% % (in total Alburnus alburnus - 44,95%), in Alburnoides bipunctatus ohridanus is 35,14%), in Alburnoides bipunctatus prespensis is 11,54% (in total Alburnoides bipunctatus - 29,0%). The most frequent monogeneans found in the fishes from both lakes are: Dactylogyrus alatus f. typica (established in 17,62% of all examined fishes) and Dactylogyrus minor (established in 16,31% of all fishes). Dactylogyrus alatus f. typica, D. minor, Diplozoon paradoxum and Paradiplozoon alburni represents a first record for the parasite fauna of fishes in Macedonia. The greatest pathological influence is associated with the monogeneans: Dactylogyrus vistulae, Paradiplozoon homoion homoion, Paradiplozoon alburn and Diplozoon paradoxum.