Dr. Murai Éva szerk.: Parasitologia Hungarica 12. (Budapest, 1979)

Parasit. Hung. 12. 1979. Protozoan Parasites of Fish Species Indigenous in Hungary Dr. Kálmán MOLNÁR Veterinary Medical Research Institute, Hungarian Academy of Sciences, Budapest "Protozoan parasites of fish species indigenous in Hungary" - Molnár, K. - Parasit. Hung. 12^ 5-8. 1979. ABSTRACT. A list is presented of 34 protozoan species parasitic in different fish hosts indigenous in natural habitats and pond farms of Hungary. Among the parasite species listed one was observed for the first time in Europe, and 17 for the first time in Hungary. Among the protozoan parasites affecting fish in Hungary only the coccidia have been studied in greater detail (PELLÉRDY and MOLNÁR, 1968; MOLNÁR and PELLÉRDY, 1970; MOLNÁR, 1978). Information has generally been scanty on other protozoan fish parasites. Early in this century KELLER (1910) had reported occurrence of the myxosporidia Myxobolus oviformis, following that FIBIGER et KAHLS (1929) mentioned Henneguya psorospermica. Later JACZO (1940, 1942) described Chloromyxum rutili, Myxobolus hungaricus, M. varia bilis and M. heterocapsularis as new species, and confirmed the incidence of M. muelleri and M. pfeifferi. During the recent decade LOM (19 70) demonstrated occurrence of Tricho- dina species in hosts taken from the river Tisza; apart from T; cf. rostrata Kl) LE M INA he described two new species as T. tisae and T. modesta

, and two new subspecies as T. nigra subsp. luciopercae, and T. nigra subsp. siluri

. ERGENS et al. (1975) observed the incidence of Myxidium macrocapsulare, Zschokkella nova, Chilodonella cyprini

, Ichthyophthirius mul- tifiliis, Apiosoma campanula, A. piscicola and Trichodinella epizootica in fish hosts populating the river Tisza in Hungarian territory. My own related investigations (MOLNÁR, 1962, 1971) have up to now covered 17 protozoan fish parasites, affecting chiefly herbivorous hosts. A survey of the species I identified in pond farms and natural habitats is presented in this paper. Material and Methods During the past 18 years fish were regularly taken from Hungary' s natural habitats (Lake Balaton, Lake Velence, river Danube, river Tisza, etc.) for detailed parasitological examination. Among the protozoan parasites found those of economicaUy important incidence were typed to species level, but in most cases we had to content ourselves with identification of the genus. Flagellata and Ciliata were examined alive as well as after fixation in methanol and staining with the Giern sa technique. Spore-forming uni cellular s were additionally preserved in glycerol-gelatine, and were occasionally also studied histologically.