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The study presents for the first time the Cherna River, southern Bulgaria, Aegean water basin, the results of research on the biological diversity and helminth communities of the Round-scaled barbell Barbus cyclolepis Heckel, 1837. 30 specimens of B. cyclolepis are studied. Infection by 5 species of helminths are found (Allocreadium isoporum (Loos, 1894); Bathybothrium rectangulum (Bloch, 1782); Caryophyllaeus laticeps (Pallas, 1781); Capillaria petruschewskii Zeder, 1800; Neoechinorhynchus rutili (Müller, 1780)). The infection indices and the dominant structure of helminth communities are presented. Basic biotic indices are determined. Helminth communities are analyzed at two levels: infracommunity and component community. All established parasite species are autogenous for the helminth communities of the Round-scaled barbell from the freshwater ecosystem of the Cherna River. New data for helminths and helminth communities of B. cyclolepis are presented. The bioindicator significance of helminths and helminth communities are discussed. [ABSTRACT FROM AUTHOR]

During 2018, 22 specimens of the round-scale barbell from the Tamrashka River (Bulgaria) were examined for helminths. B. cyclolepis is an endemic fish species of the Maritsa River Water Collection. Five parasite species (Allocreadium isoporum Ergens & Lom, 1970; Caryophyllaeides fennica (Schneider, 1902) Nybelin, 1922; Pomphorhynchus laevis (Müller, 1776); Rhabdochona hellichi (Šramek, 1901) Chitwood, 1933; Rhabdochona gnedini Skrjabin, 1948) belonging to four classes and four families were fixed. The Tamrashka River is a new habitat for All. isoporum, C. fennica, P. laevis, Rh. hellichi and Rh. gnedini of B. cyclolepis in Bulgaria. The dominant structure of the parasite communities was discussed based on the level of the component community. The bioindicator role of the studied parasite populations and communities are presented. [ABSTRACT FROM AUTHOR]

During summer 2019, 15 specimens of round-scaled barbell (Barbus cyclolepis Heckel, 1837) and 12 specimens of Orpheus dace (Squalius orpheus Kottelat & Economidis, 2006) from Topolnitsa River were collected and examined with standard techniques for parasites. Helminth parasites were recorded in 9round-scaled barbell specimens (60%) and 7 Orpheus dace specimens (58.33%) from Topolnitsa River. Only one parasite species was identified in both cyprinid fishes -the acanthocephalan species Pomphorhynchus laevis (Zoega in Müller, 1776). Bioindicator significance of established parasite species was discussed for ecological evaluation of the state of the studied freshwater ecosystem. New data for the helminths of round-scaled barbell and Orpheus dace from Topolnitsa River are presented. [ABSTRACT FROM AUTHOR]