Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 9. (Budapest, 1976)
These observations are in line with those of LJAJMAN (1948, 1951) and BAUER (1959) suggesting the possibility of D. vastator to occur in the carp also during the winter. It is likely, that under particular conditions (appropriate temperature, unnatural keeping) more intesive permanent infection may develop. It can therefore be concluded that overwintering eggs are likely to play less significant role in the epidemiology of dactylogyrose of the carp than it has previously been proposed. The majority of the worms recovered are specimens typical of D. vastator. Even those specimens which correspond by size to D. crassus , do not differ by shape from typical D. vastator. Therefore, there appears to be little ground to support KOLLMANN's (1970b) suggestion to identify the worms found on the carp in winter months as D. crassus . Moreover, since the morphological differences between D. vastator and D. crassus are almost negligible, not only the occurrence of the latter species on carp but also the validity of the species D. crassus has to be considered as dubious. MOLNÁR, K.: Megfigyelések a Dactylogyrus vastator (Monogenea) előfordulásáról A szerző ismerteti megfigyeléseit, melyek szerint a D. vastator télen is gyakran kimutatható egy- és kétnyaras halak kopoltyújáról. Magasabb hőmérsékleten, akváriumban tartott pontyokon a D. vastator-fertőzöttség néhány hónapon keresztül fennállott, és korábban nem fertőzött pontyokra, valamint kárászokra átvihető volt. References BAUER, O.N. (1959): Ekologija parazitov presnovodnih rib. Izv. Goz. NIORH., 49. 5206. KOLLMANN, A. (1968): Dactylogyrus crassus Kulwiec, 1927 (Trematoda, Monogenoidea) auf den Kiemen von Karpfen. - Zool. Anz. , 180 . 43-49. KOLLMANN, A. (1970a): Dactylogyrus vastator Nybelin, 1924 (Trematoda, Monogenoidea) als Krankheitserreger auf den Kiemen des Karpfens (Cyprinus carpio L. ) I.Teil. - Z. Fischerei NF., 18. 129-150. KOLLMANN, A. (1970b): Dactylogyrus vastator Nybelin, 1924 (Trematoda, Monogenoidea) als Krankheitserreger auf den Kiemen des Karpfens (Cyprinus carpio L. ) II. Teil. - Z. Fischerei NF., 1_8. 259-288. LJAJMAN, E. M. (1948): Novije dannije po epizootologii daktilogiroza. - Ribnoje hozjajstvo, _12. 32-36. LJAJMAN, E. M. (1951): Vlijanije temperaturi vodi po razmnozenije monogeneticheskovo sosalshshika D. vastator. - Tr. Mosk. Helm. Inst. ribn. prom, i hoz. im Mikojana, 4. 197-204. NYBELIN, O. (1925): Dactylogyrus-studier vid Aneboda Fisherifösöksstation Sörtryck ur Skriffer utgivna a Södra. - Sveriges Fiskeriförening, 42-72. PAPERNA, I. (1963): Dinamics of Dactylogyrus vastator Nybelin (Monogenea) populations on the gills of carp fry in fish pond. - Bamidgeh, L5. 31-50, VLADIMIROV, V.L. (1971): Immunitet u rib pri daktilogiroze. - Parazitologija, 5_. 5258. WUNDER, W. (1929): Dactylogyrus Krankheit der Karpfenbrut, ihre Ursache und ihre Bekämpfung. - Z. Fischerei, 27. 511-541. Received: 21 June, 1976. Dr. MOLNÁR, K. Veterinary Research Institute of the Hungarian Academy of Sciences 36 H-1143 Budapest, Hungária krt. 21.
