DYNAMICS OF PARASITOFAUNA OF DIFFERENT AGE GROUPS OF IDE LEUCISCUS IDUS (L. 1758) OF LOWER IRTYSH
The paper aims to identify the age-related dynamics patterns of distributing the parasitofauna of ide in the Lower Irtysh. The composition of the ide parasitic community is represented by sixteen species belonging to the classes Monogenea, Cestoda, Trematoda, Nematoda, Copepoda, where Trematoda class is remarkable for the highest species diversity (9 species). It has been stated that the composition of the ide parasite fauna is distributed nonuniformly within the age groups. The study noted the presence of parasite species invading ide of any age group; there were also parasitic organisms observed either in young ide representatives, or in older fish species, as well as there were found parasite species not belonging to any distribution system. According to the analysis results of the age dynamics of the average invasion intensity, it has been found that the representatives of O. felineus and R. campanula prevailed in the number of specimens in all age groups of ide. The dynamics of the invasion extensity conditionally corresponds to three groups: EI growing with the fish aging, EI with a decreasing dynamics, constant EI = 100% (represented by R. campanula). The parasitofauna of the Lower Irtysh ide is similar to the parasite fauna of ide species inhabiting other water bodies, and shows the peculiarities of occurrence both within a separate age group and in the dynamics of occurrence parameters with fish aging