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Indicators that characterize the state of lipid peroxidation and antioxidant protection in rainbow trout grown in the North-West of the country in normal conditions have been determined. It was found that the amount of malondialdehyde, antioxidant enzymes and total phospholipids had no significant changes in the samples taken in the farms of the Leningrad region and the Republic of Karelia, while the concentration level depended on the age of the fish. The maximum content of the final products of lipid peroxidation malondialdehyde was recorded in fish weighing 600-720 g, which is associated with a high fat content in the diet and the inability of the body to metabolize them completely. The developing pathological process in the body of fish when infected with  Yersinia  accelerated the intensity of lipid peroxidation, as a result, toxic lipid peroxides accumulated in organs and tissues, and the concentration of malondialdehyde increased from 65.4 to 95.2 %. There were also decreases in the activity of antioxidant protection: the value of catalase decreased from 6.7 to 23.7 %, peroxidase 7.1-19.5 %, the maximum drop in the activity of ceruloplasmin 9.5 %.

Evaluation of the effect of fish yersiniosis on the course of antioxidant protection processes in trout