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The generic affiliation of protozoans described as Sinuolina gilsoni Debaisieux, 1925 is discussed. The species is transferred to the genus Sphaerospora Thélohan, 1892 and regarded as synonymous with Sinuolina gilsoni Debaisieux, 1925; Sphaerospora anguillae Wierzbicka, 1986; and Hoferellus gilsoni (Debaisieux, 1925) Lom, Dykova, 1989. In addition, the parasites Sphaerospora reichenowi Jacob, 1953 and S. sphaerocapsularae Wierzbicka, 1986 are shown to be separate species.
Parasite fauna of the ciliates inhabiting the gills of the blue bream from Dąbie Lake connected with the Odra River estuary, consisted of 5 species, namely: Chilodonella hexasticha, Ch. piscicola, Capriniana piscium, Ichthyophthirius multifiliis, Trichodina kupermani. These parasites were recorded for the first time on the blue bream in Poland. T. kupermani is a new species for the Polish fauna, while the blue bream is a new host for C. piscium. The seasonal dynamics of the infection of the fishes with T. kupermani was studied and the detailed measurements of this species are provided.
A total of seven species of parasitic ciliates was recovered from the studied fishes of Dąbie Lake located in the estuary of the Odra River. The common bream harboured the following species: Chilodonella hexasticha, Ch. piscicola, Ichthyophthirius multifiliis, Trichodina modesta, and Trichodinella epizootica. The white bream turned out to be the host for: Ch. piscicola, Capriniana piscium, I. multifiliis, T. modesta, Tripartiella copiosa, and T. epizootica. Three of the above species constitute new records for the parasite fauna of the common bream in Poland, while five-new records for the white bream. Ciliates T. modesta are a new species for Polish parasite fauna. The white bream became a new host for C. piscium. The measurements and photographs of T. modesta and T. copiosa are provided in this paper.
In the available literature there is only one paper of M. S. Komarowa (1951) according to which Asymphylodora tincae (Modeer, 1780) possesses a 1-year growth cycle. The studies were carried out in 1962-63 with Tinca tinca (L.) from lake and pond environment. These two environments showed different intensity and extensivity of infestation. Mature and young parasites of the species invariably found throughout the investigation period. Trematodes from fishes of the same environment exhibited simultaneously highly varying stages of maturity. The author feels that the development of A. tincae in final host is very short and that in our climatic conditions it possesses more than one developmental cycle.
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In Poland, single individuals of A. imitans have been found sporadically, whereas a common incidence of the species is raported in foreign literature. The material of Abramis brama (L.) derived from Vistula (Toruń region), investigated by the author in the years 1962-1963 was found to be infested with A. imitans in 79%; the degree of invasion ranged from 1-224 parasites. The literature data and the author's observations suggest that, in our lakes, A. brama does not harbour the species.
Studied specimens of the blue bream, Abramis ballerus (L.) originated from Dąbie Lake-a component of the Odra River estuary (northwestern Poland). The gills of the host fish yielded a number of adult specimens and different developmental stages of Trichodina kupermani Arthur et Lom, 1984. Among the developmental stages there were post-cleavage and post-conjugation individuals. There were distinct morphological differences observed between these two developmental forms. They both differed also form the adult specimens.
Gut content of Branchiobdella spp. was examined in 83-945 individuals belonging to 4 species, collected from 31 individuals of Astacus astacus (L.) and 12 individuals of Pontastacus leptodactylus (Esch.) from north-western and southern Poland. The results show the food of B. hexodonta Gruber, 1883 dwelling in the crayfish gill cavity to include fragments of the crayfish gills, which identifies the species as a parasite. In contrast, B. parasita Henle, 1835, B. kozarovi Subchev, 1978 and B. balcanica sketi Karaman, 1967 are found on the external covers of the crayfish are not parasitic. They feed on diverse items derived from the ambient environment and are thus epibiontic. Cannibalism was observed in all the species examined. Neither cannibalism nor the presence of larvae-containing cocoons of Argulus foliaceus (L.) (Branchiura), a fish parasite, on the crayfish carapace has been recorded in the literature so far.
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