Objective of research: a study of biochemical blood values of herring gulls infected by Tetrabothrius erostris. Materials and methods: Blood plasma of adult individuals and 4 weeks old nestlings of herring gulls was used for biochemical analysis. To determine the data of protein, lipid, carbohydrate, and mineral metabolism the bird blood was examined by different research methods. The intensity of invasion by T. erostris cestodes was detected in parasitological examination. Results and

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... n: It was found that the minor changes occur in the bird's blood biochemistry at a low intensity of T. erostris invasion. At the same time, we registered the significant metabolic changes in adult gulls infected with T. erostris in comparison to the metabolic data of non-infected birds. The data of protein, lipid and carbohydrate metabolism in blood of adult gulls change depending on the intensity of invasion by T. erostris.