Анотація:
Tracheliastes maculatus Kollar, 1836 a pathogenic parasite of Abramis brama of the elder age was found in A. brama from the Krasnooskolian and Pechenegian water storage reservoirs (the Kharkov Region). Dynamics of A. brama invasion was studied in different years and in different seasons. Distinctions of A. brama invasion were determined in different areas of the water storage reservoir. The morphology of Tracheliastes maculatus Kollar is studied in detail and described.