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New and traditional techniques of electron microscopy, and successful attempts at an experimental infection of fish with cocidia provided a base for a considerable taxonomic revision within the group of the fish coccidia. The authors present contemporary views on the biology of these protozoans (life cycles, host specifity) and new systems of taxonomic classification according to Dykova and Lom (1983), Levine (1983) and, the most recent, according to Overstreet et al. (1984). The list of the fish coccidia described from Poland, in agreement with the system of Overstreet, is also presented.
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Kokcydia ciernika - Gasterosteus aculeatus (L.)

72%
Using the method of parasitological section and staining method H-E for histopathological sections, the author examined 281 indivuals of stickleback G. aculeatus (L.) during the years 1982-1985. In 65 individuals (lenght 2.5-6.0 cm) the presence of unsporulated oocysts of Eimeria aculeati Jastrzębski, 1984 in the intestine was found, in 27 fish of similar lenght - the presence of unsporulated oocysts of Eimeria żarnowskii Jastrzębski, 1982. Species was determined after sporulation of the oocysts in aquarium water, at 20°c. In the liver of two sticklebacks, 8.5 and 9.0 cm in lenght, numerous focuses with the oocysts of Eimeria gasterostei (Thélohan, 1890) Doflein, 1909 were found. In drying fresh smears of the liver a longitudinal, circumferential suture on the sporocyst wall was visible (fig. 1, 2) which made the authors revise the species and determine it as Goussia (Goussia) gasterostei (Thélohan, 1890) - s. Eimeria gasterostei (Thélohan, 1890) Doflein, 1909. G. gasterostei is a parasite new for Poland. Histopathological studies revealed the existence of intraplasmic meronts in the life cycle of E. aculeati, and these were classified by the authors in the following groups: 6-merozoit, 12-merozoit and 22-merozoit and are supposed to represent at least three generations of merogony. It was found that in the development of Eimeria żarnowskii the trophozoites and gamonts parasitise on the surface of the intestine epithelium (fig. 5, 6). In 19 of 265 fish two coccidia were found in the intestine: E. aculeati and E. żarnowskii. The extensity of the infection during the years 1982-85 is presented in table 1. The development forms of the parasites are presented in figs. 1-8.
The aim of the study was to estimate the prevalence of intestinal parasitic infections in mink. A preliminary investigation was conducted on nine Polish mink farms (approx. 510,000 animals surveyed). One hundred and five aggregated samples of mink feces were randomly collected and examined by flotation coproscopy and McMaster’s method. Although coccidia oocysts (of unrecognized genera) were detected in samples from all the farms, the intensity of infections was low (OPG from 0 to 5500). Data concerning the prevalence of intestinal parasitic infections in farm mink in Poland may constitute an important contribution to a research-based explanation of the actual role of mink in the transmission of parasitic zoonoses. It is worth noting that although coprological investigations showed a widespread prevalence of coccidian infections in these animals, no developmental forms of other intestinal parasites, such as the eggs of roundworms occurring in carnivores, were found. These results suggest that adequately prepared (e.g. composted) mink manure can be used instead of chemical fertilizers as a valuable natural fertilizer for arable crops without creating a hazard for humans.
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