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It was conducted during the 2021\u20132022 at two sites: Mingachevir reservoir in central Azerbaijan and in Neftchala district where the river finally enters the Caspian Sea through a delta of the Kura River estuary. The diagnosis of oocysts was performed microscopically. Fine smears from the intestine epithelial layers stained by Ziehl-Neelsen for Cryptosporidium oocysts. To identify Eimeria oocysts, each fish's faecal material and intestinal scrapings were examined directly under a light microscope in wet samples on glass slides with a coverslip. Results revealed a prevalence of Cryptosporidium and Eimeria species infections in fish hosts from both territories Rutilus caspicus, Alburnus filippi, Abramis brama orientalis and Carassius gibelio. Of 170 investigated fish specimens, 8.8% (15\/170) were infected with Cryptosporidium species oocysts. Eimeria species oocysts were identified in 20.6% (35\/170). The presence of Cryptosporidium and Eimeria infections in fish specimens are natural infections. However, their presence in fish species may be attributed to the age of the fish species and water pollution. This is the first report regarding the prevalence of Cryptosporidium oocysts in fish species in Azerbaijan.<\/jats:p>","DOI":"10.2166\/wh.2024.025","type":"journal-article","created":{"date-parts":[[2024,3,26]],"date-time":"2024-03-26T13:59:38Z","timestamp":1711461578000},"page":"773-784","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":3,"title":["<i>Cryptosporidium<\/i> spp. and <i>Eimeria<\/i> spp. (Apicomplexa: Eimeriorina) of freshwater Cyprinid fish species in the Kura River basin in Azerbaijan territory"],"prefix":"10.2166","volume":"22","author":[{"given":"Simuzer","family":"Mamedova","sequence":"first","affiliation":[{"name":"a Institute of Zoology, Ministry of Science and Education Republic of Azerbaijan, Baku, Azerbaijan"},{"name":"b Department of Life Sciences, Khazar University, Baku, Azerbaijan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0733-0470","authenticated-orcid":false,"given":"Panagiotis","family":"Karanis","sequence":"additional","affiliation":[{"name":"c Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany"},{"name":"d Department of Basic and Clinical Sciences, University of Nicosia Medical School, Nicosia, Cyprus"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"945","published-online":{"date-parts":[[2024,3,26]]},"reference":[{"key":"key-10.2166\/wh.2024.025-1","first-page":"405","volume-title":"\u0420\u044b\u0431\u044b \u043f\u0440\u0435\u0441\u043d\u044b\u0445 \u0432\u043e\u0434 \u0410\u0437\u0435\u0440\u0431\u0430\u0439\u0434\u0436\u0430\u043d\u0430. 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M. 1992 \u0424\u0430\u0443\u043d\u0430 \u0440\u044b\u0431-\u043f\u0430\u0440\u0430\u0437\u0438\u0442\u043e\u0432 \u0411\u043e\u043b\u044c\u0448\u043e\u0433\u043e \u041a\u044b\u0437\u044b\u043b\u0430\u0433\u0430\u0447\u0441\u043a\u043e\u0433\u043e \u0437\u0430\u043b\u0438\u0432\u0430 \u041a\u0430\u0441\u043f\u0438\u0439\u0441\u043a\u043e\u0433\u043e \u043c\u043e\u0440\u044f (Fish Parasite Fauna of the Big Kyzylagach Bay of the Caspian Sea). PhD thesis in biology dis.\/ \u2013 Baku, 1992. \u2013 188 s."},{"key":"key-10.2166\/wh.2024.025-56","doi-asserted-by":"publisher","DOI":"10.1128\/AEM.71.1.131-139.2005"},{"key":"key-10.2166\/wh.2024.025-57","doi-asserted-by":"publisher","DOI":"10.1016\/S0020-7519(99)00033-8"},{"key":"key-10.2166\/wh.2024.025-58","first-page":"345","article-title":"Sur deux coccidies nouvelles, parasites de l'epinoche et de la sardine (on two new coccidia, parasites of stickleback and sardine)","volume":"42","author":"Thelohan","year":"1890","journal-title":"C. R. 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