Parasitofauna of the Ohrid trout (Salmo letnica Karaman, 1924) from Lake Ohrid (Macedonia)

In the period from April, 1995 to March, 1996, 131 specimens of the Ohrid t rout (Salmo letnica, Karaman) 1924 from the Macedonian part of Lake Ohrid w ere examined parasitologically. A total of 99 fishes (75.57%) were found to be infected. The presence of 6 parasite species: Diclybothrium sp., Eubothrium crassum, Eubothrium salvelini, Cyathocephalus truncatus, Proteocephalus neglectus an d Pomphorhynchus laevis. The highest prevalence occurred with Eubothrium cr assum (48.09%) and the lowest with Pomphorhynchus laevis (0.76%). The great est number of parasite specimens was found in the cases of infection with E ubothrium crassum (55) followed by Proteocephalus neglectus (45) and Cyatoc ephalus truncatus (40). Fulton's condition coefficient among the infected fishes was 1.03 (average) and among the uninfected trouts it was 1.10. A high prevalence (75.57%) wa s noted which was higher than in other fish species of Lake Ohrid. The finding of 3 parasite species mentioned in our study. is the first time they have been detected among the parasitofauna of Lake Ohrid and Macedoni a: Diclybothrium sp., Eubothrium salvelini and Proteocephalus neglectus. From the results of our investigations, we can add a new host, Salmo letnic a, for some parasite species: Diclybothrium sp., Eubothrium salvelini, Cyat hocephalus truncatus, Proteocephalus neglectus and Pomphorhynchus laevis to the list of known hasts.