Dr. Murai Éva szerk.: Parasitologia Hungarica 22. (Budapest, 1989)
ies of TIKHOMIROVA (1975) it is known that these parasites can develop only in the presence of fish louse ( Argulus) as intermediate host. However, it is not clear whether fish younger than two years are free from skrjabillanids because they are kept in ponds free from fish louse and thus there is less opportunity for infection, or because susceptibility is age dependent. My unpublished observations and data published by TIKHOMIROVA (1971) indicate that the probability of A. scardinii and M. leucisci infection in rudd living in natural waters increases with age. It is rather uncommon but not at all surprising that besides the rudd the grasscarp is the other fish species which is parasitized by two morphologically similar skriabillanids of different location. The two fish species are closely related. Though In a given fish species the skrjabillanids living freely in the abdominal cavity and those parasitizing the swimbladder serosa are highly similar in morphology of the buccal apparatus and the tail end of the males, by its location and measurement Molnárja leucisci corresponds to the species S. amuri , while Agrachanus scardinii , coiled up in the serosa, bears resemblance to S. schigini . MOLNÁR K.: Két skrjabillanida nematoda, Sinoichthyonema amuri és Skrjabillanus schigini, előfordulása Magyarországon amurban (Ctenopharyngodon idella) A Távol-Keletről és a Szovjetunióból ismert két fonálféreg fajt Sinoichthyonema amuri (Garkavi, 1972) és Skrjabillanus schigini Tikhomirova et Rudometova, 1975 került kimutatásra Magyarországon kétnyarasnál idősebb amurokból ( Ctenopharyngodon idella) . Az előbbi faj a hasüregi csepleszeken szabadon, az utóbbi a savóshártyákon feltekeredve fordult elő. REFERENCES BAUER, O.N. (ed.) (1587): Key to the parasites of freshwater fishes of the fauna of the Sovjetunion 3. Parasitic metazoa (second part) (in Russian). - Publ. house NAUKA. Leningrad, pp. 583. BUZA, L., MOLNÁR, K. and SZAKOLCZAI, J. (1970): The occurrence of Bothriocephalus gowkongensis in Hungary, (in Hungarian). - Halászat, 16: 27. GARKAVI, B.L. (1972): A new nematode Skrjabillanus amuri (Camallanata: Skrjabillanldae^ from grasscarp. (in Russian). - Parazitologiya, 6: 87-88. LOMAKHIN, V.V. and TSCHERNOVA, R.N. (1980): A new nematode genus - Karkavillanus gen. n. (Camallanata: Skrjabillanidae) (in Russian). - Trudi GELAN, 30: 45-51. MOLNÁR, K. (1966): On some little known and new species of the genera Philometra and Skrjabillanus from fishes in Hungary. - Acta vet. hung., 16_: 143-158. MOLNÁR, K. (1971): Protozoan diseases of the fry of herbivorous fishes. - Acta vet. hung., 21: 1-14. MOLNÁR, K. (1984): Occurrence of new monogeneans of Far-East origin on the gills of fishes In Hungary. - Acta vet. hung., 32: 153-157.
