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

Parasit. Hung. 12. 1979. The Occurrence of Thelohanellus dogieli Achmerov, 1955 (Myxosporidia) on Carp (Cyprinus carpio) in Fish Ponds in Hungary Galina JENEY Fisheries Research Institute, Szarvas "The occurrence of Thelohanellus dogieli Achmerov, 1955 (Myxosporidia) on carp (Cyprinus carpio) in fish ponds in Hungary"- Jenei, G. - Parasit. Hung. 12. 19-20. 1979. ABSTRACT. A common occurrence of the cyst of ThelohaneUus dogieli Achmerov, 1955 on the fins of carp fry bred in South Hungarian fish ponds i

s reported. This parasite known before only in the Far East, migh come from fish imported to Europe. In Hungary only a few species are known of the fish parasite Myxosporidia (JACZO, 1940; MOLNÁR, 197 1). There is no written evidence of the occurrence of the species Thel ohanellus. SCHULMAN's monograph (1966) mentiones the occurrence of six Thelohanellus species in the Soviet Union. The author found cysts of the species Thelohanellus on

1 carp. The present paper deals with the occurrence and morphology of the cyst of a ThelohaneUus species found on common carp fry. Material and Method The fishwere obtained from fisheries in Southern Hungary. They were examined under a stereo-microscope. Spores separated from the cysts were preserved in glycerol-gelatin solution but a part of them was stained in Giern sa's solution. Measurements were taken on alive spore. Occurrence The first time infestation was observed in August 1977 in twelve fish ponds out of twenty-one at Szaivas and Biharugra (Com. Békés). On the dorsal and caudal fins there were whitish cysts of the size of a pinhead, clearly visible on the surface. Mature spores appeared in cysts in August. They kept growing during the autumn and disappered in winter. Spores are egg-shaped or ovoid, the anterior pole slightly recedes, their walls are smooth. There is only one polar capsule and one amoeboid sporoplasm in them. The polar capsule is almost spherical, the anterior pole is rather narrow. The filament, spun into a helix is clearly visible in the polar capsule. Spore waUs are strong, with a visible scar on them. The length of spores: 17.2 to 18. 6/am, width: 10.2 to 12.4^um. Length of polar capsule: 8. 4 to 8. 6 jam, width: 6.4 to 6.6 p.m. In spite of the common occurrence no pathological observations were made. Discussion On the basis of the measurements and morphology of the spore this species can be identified with the ThelohaneUus dogieli. This species was described first by SCHULMAN