Ecologohelmintological study of Squalius cephalus (Linnaeus, 1758) from the Danube River, Bulgaria
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For 2019-2021, seven specimens of chub Squalius cephalus (Linnaeus, 1758) caught from the upper section of the Danube River in Bulgaria were examined for helminths. The studied habitat (Kudelin biotope) is a border section of the Danube River between Bulgaria, Serbia, and Romania. During the helminthological examination, seven helminth species were found – one trematode species (Sphaerostoma bramae (Müller, 1776) Lühe, 1909); one cestode species (Caryophyllaeides fennica (Schneider, 1902) Nybelin, 1922); two acanthocephalan species (Acanthocephalus anguillae (Müller, 1780) Lühe, 1911 and Pomphorhynchus laevis (Zoega in Müller, 1776) Porta, 1908); three nematode species (Eustrongylides excisus Jägerskiöld, 1909 (larvae); Pseudocapillaria tomentosa (Dujardin, 1845) Moravec, 1987 and Rhabdochona denudata (Dujardin, 1845) Railliet, 1916). Kudelin biotope is a new habitat for the seven endohelminth species of chub that were found. New data on the ecological indices (mean intensity, mean abundance, prevalence) of the endohelminths are provided. Squalis cephalus is a new host record for two of the found helminth species. Knowledge of the helminths and the ecological indices of helminths is important for protecting fish resources and human health.
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