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Ecologoparasitological research was done based on the helminths and helminth communities of the Prussian carp (Carassius gibelio (Bloch, 1782)) from the freshwater ecosystem of the Panicheri Reservoir, Aegean Water Basin, Bulgaria. As a result of the examined nine specimens of the Prussian carp, two species of helminths were found: Ligula intestinalis (Linnaeus, 1758), larvae and Pomphorhynchus laevis (Müller, 1776). The dominant structure of the helminth communities was determined. The Panicheri Reservoir is a new habitat in Bulgaria of P. laevis and L. intestinalis from C. gibelio. C. gibelio is a new host record for L. intestinalis in Bulgaria. The two helminth species are core species for the helminth communities of the examined species of the freshwater fish. P. laevis was distinguished with higher prevalence and mean intensity (P%=33.34; MI=1.34) than L. intestinalis (P%=22.23; MI=1.0). The circulatory pathways of the helminth flow were traced. [ABSTRACT FROM AUTHOR]

During the summer of 2015, 13 specimens of barbel (Barbus barbus (Linnaeus, 1758)) were examined by standard techniques for parasites. All the examined barbels (100%) were infected with the acantocephalan Pomphorhynchus tereticollis.The study of the intestinal content and fishfood fixed the presence mainly of Unionidae molluscs.The swollen river mussel (Unio tumidus Philipsson, 1788; Mollusca, Unionidae) is one of the most common Unionidae in the studied habitat (Biotope Vetren, the DanubeRiver). The aim of the research wass to study the lead content in samples of sediments, Unio tumidus, Pomphorhynchus tereticollis, skin, muscles and liver of B. barbus from the Danube River. From the tissues and organs of the studied fish specimens Barbus barbus, the lowest concentrations of lead were found in the muscles. The content of lead in the samples of liver is higher than in the skin and muscles. The alteration was in the following order: Pbliver>Pbskin>Pbmuscles. P. tereticolliss howed significantly higher content of lead than its host tissues and organs. The content of lead in Unio tumidus was higher than the content of lead in the tissues and organs of B. barbus. A highly significant correlation (p<0.01) was fixed for the relationships between the Pb content in the acanthocephalan and mollusks (CP. tereticollisPb-C U.tumidusPb) and between that in the acanthocephalan and the skin of the fish (CP. tereticollisPb-CskinPb). [ABSTRACT FROM AUTHOR]

During the ecological study of 45 specimens of freshwater bream (Abramis brama (Linnaeus, 1758)) by applying standard techniques for parasites, an infestation with the acantocephalan Pomphorhynchus tereticollis was found. The aim of the present study is to establish the content of nickelin the water, sediments, parasites, tissues and organs of A. brama and its parasite Pomphorhynchus tereticollis, and the possibilities of accumulation and circulation in the freshwater ecosystem of the Danube River. From the tissues and organs of the studied specimens Abramis brama, the content of nickel in the skin samples was higher than in the liver and muscles and ranged as follows: Niskin>Niliver>Nimuscles (in both infected and uninfected specimens). The obtained values for nickel content in the liver and skin of the uninfected A. brama were found to be higher than the obtained values for nickel content in the liver and skin of A. brama infected with P. tereticollis. In contrast to that, the nickel content in the muscles of the infected A. Brama was higher than the nickel content in the muscles of the uninfected specimens of freshwater bream. The acanthocephalan Pomphorhynchus tereticollis showed significantly higher content of nickel than its host tissues and organs. Significant correlations (p<0.05) were fixed for relationships between СP. tereticollisNi - СliverNi, СP. tereticollisNi- СmuscleNi и СP. tereticollisNi - СskinNi. [ABSTRACT FROM AUTHOR]

During 2015, 76 specimens of freshwater bream (Abramis brama (Linnaeus, 1758)) were examined by means of standard techniques for parasites. Seven species of parasites (Paradiplozoon homoion (Bychowsky & Nagibina, 1959), Dactylogyrus yinwenyingae (Gusev, 1962), Asymphylodora tincae (Modeer, 1790), Caryophyllaeus fimbriceps (Annenkova-Khlopina, 1919), Acanthocephalus lucii (Miiller, 1776), Acanthocephalus anguillae (Müller, 1780), Contracaecum microcephalum (Stossich, 1890), larvae) were fixed. New parasite and host records were determined. The analysis of the dominant structure of the found parasite taxa were presented to the level of the component communities. All fixed parasite species were component for the parasite communities of examined fish with the exception of A. lucii and A. anguillae. A. lucii is a core parasite species and A. anguillae is an accidental parasite species for the helminth communities of freshwater bream. New data for the lead content in sediments, tissues and organs of bream from the Danube River are presented. From the tissues and organs of the studied fish specimens of A. brama, the lowest concentrations of lead were found in the muscles. [ABSTRACT FROM AUTHOR]