Abstract
The aim of this study was to determine the ectoparasite helminth fauna of Turkey endemic fish, Barbus oligolepis (Battalgil, 1941), from Susurluk Stream in the village of Yıldız, Balıkesir. For this purpose, a total of 81 individuals of B. oligolepis were caught seasonally by electrofishing between the 2020 spring (April) and 2021 winter (February) and the ectoparasite helminth fauna was studied. Only two monogenean species, Dactylogyrus carpathicus (Zakhvatkin, 1951) and Paradiplozoon homoion (Bychowsky & Nagibina, 1959), were identified. As a result of this examination P. homoion was the most prevalent and the highest number in the host fish. This species was present throughout all seasons. A total of 126 specimens of P. homoion infected 29 of the 81 fish examined, with a prevalence and mean intensity of 35.8 (1.5 %), parasite/fish respectively. Additionally, infection parameters for two monogenean species were calculated in accordance with the season, host size and sex. This study is the first to report the presence of an ectoparasitic helminth for B. oligolepis in this location in Turkey. P. homoion and D. carpathicus are also new ectoparasitic helminth records from this host fish and location. In addition, sequence data of P. homoion from host fish were reported to GenBank for the first time with this study. As a result, new information about the geographical distribution and host range of two parasite species has been added.
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