Honcharov S. Paracoenogonimosis of freshwater fish (distribution, pathogenesis and diagnosis)

The thesis gives the evidences of distribution, pathogenesis and diagnosis study of paracoenogonimosis in freshwater fish from natural water reservoirs in Southern Ukraine. Age dynamics and distribution of metacercaria in the muscle tissue of fish were studied. The level infestation of freshwater fish with paracoenogonimosis agent in association with other parasites was determined. The influence of paracoenogonimosis on morphological and biochemical features of infested fish was studied. The basic changes in the outer shell of Paracoenogonimus ovatus metacercaria were observed. The possibility of Paracoenogonimus ovatus metacercaria to reach the mature stage in the gastrointestinal tract of laboratory rats was proved. Comparison of laboratory study methods of paracoenogonimosis was conducted. The highly efficient method of metacercaria extraction from cysts was developed by the author. Its advantages over other methods evaluated.