Изменение фауны некоторых биогельминтов рыб озера Севан и их промежуточных хозяев в условиях гидроэкологических преобразований

The infeсtion of biohelminths of fishes in Sevan Lake is studied. 9 types of biohelminths are revealed: in a body cavity, intestines, heart and crystalline lenses of eyes. The analysis of changes of specific composition of the helminths in dy-namics, taking into account changes of fauna of their intermediate hosts, in condi-tions of hydroecological transformations of the lake is conducted.