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Revina, O., Institute of Food Safety, Animal Health and Environment “BIORˮ, Riga (Latvia);Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia);Institute of Food Safety, Animal Health and Environment “BIORˮ, Riga (Latvia) | Revins, V., Institute of Food Safety, Animal Health and Environment “BIORˮ, Riga (Latvia) | Cirule, D., Institute of Food Safety, Animal Health and Environment “BIORˮ, Riga (Latvia) | Valdovska, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)

In recent years, the effective immunostimulating properties of β-glucans have been widely proven not only in mammals, but also in aquatic animals. The aim of this study was to determine the effect of dietary β-glucan supplements on the percentage of individual types of leukocytes and the haematocrit of the sea trout (Salmo trutta L.). Investigations were performed at the state fish farm ‘Tome’, hatchery ‘Pelči’ of the Institute of Food Safety, Animal Health and Environment ‘BIOR’, during a six month period (September 2018 – February 2019). On the basis of feeding with immunostimulant diets, a total of 15 000 sea trout were assigned into five groups. For blood collection healthy fish were randomly selected once a month, five 5 individuals from each group. Blood smears were made to determine the leukocyte differential count. Sampling was done once a month (September 2018 – January 2019) (n=125). Haematocrit was determined by the standard microhaematocrit method. Sampling was done once a month (January 2019 – February 2019) (n=50). We concluded that the dietary β-glucan supplements can improve the haematocrit level and effect the percentage of individual types of leukocytes of the sea trout, stimulation of the preparation for parr-smolt transformation.

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