Dr. Murai Éva szerk.: Parasitologia Hungarica 22. (Budapest, 1989)

Occurrence of two skrjabillanid nematodes, Sinoichthyonema amuri and Skrjabillanus schigini in grasscarp (Ctenopharyngodon idella) in Hungary Dr. Kálmán MOLNÁR Veterinary Medical Research Institute, Hungarian Academy of Sciences, Budapest, Hungary "Occurrence of two skrjabillanid nematodes, Sinoichthyonema amuri and Skrjabillanus schigini in grasscarp (Ctenopharyngodon idella) in Hungary". - Molnár, K. - Parasit, hung., 22: 63-66. 1989. ABSTRACT. Two skrjabillanid nematodes known from the Far East and the Soviet Union, Sinoichthyonema amuri (Garkavi, 1972) and Skrjabillanus schi gini Tikhomirova et Rudometova, 1975 are reported from grasscarp (Cteno pharyngodon idella) older than two years in Hungary. Sinoichthyonema amuri occurs freely on the mesentery while Skrjabillanus schigini is coiled up within the serous membranes. KEY WORDS: Nematoda, Skrjabillanus, Agrachanus, Slnoichtnyonema, Molnaria, grasscarp, new area of spread. With herbivorous fishes brought in for breeding (Ctenopharyngodon idella, Hypophthalmlch- thys molitrix, H. nobilis

) numerous new parasites have been Introduced to Europe. In Hungary the parasitological consequences of fish transfers were reported by SZAKOLCZAi and MOLNÁR (1966). The introduced parasites were mostly protozoans: these were reviewed by MOLNÁR (1971). The majority of helminths found in the three introduced fish species were monogeneans (MOLNÁR 1984). As concerns other helminths, the sole representative of the original Far-Eastern parasite fauna of these fishes was Bothriocephalus acheilognathi which was demonstrated in Hungary by BUZA et al. (1970). The first representative of helminths of the genus Skrjabillanus was S. tincae Schigin et Schigina, 1958 reported in the Soviet Union from tench. In Hungary MOLNÁR (1966) reported two Skrjabillanus spp. from rudd and described them as new species by the names S. scardinii and S. erythrophthalmi. Other known skrjabillanid species include Skrjabillanus amuri and S. schigini found in grasscarp (GARKAVI 1972; TIKHOMIROVA and RUDOMETOVA 1975) and Esocinema bohemlcum reported by MORAVEC (1977) from pike. During revision of the genus Skrjabillanus, first MORA VEC (1968) lifted out the species S. erythrophthalmi for which he created the genus Molnárja

. Subsequently TIKHOMIROVA (1971) established the genus Agrachanus for S. scardinii and LOMACHIN and TSCHERNOVA (1980) created the genus Garkavillanus for S. amuri

. Later on BAUER et al. (1987) identified Molnárja erythrophthalmi with the species erroneously described as Philometra leucisci