Hematological parameters of sturgeon fish grown in the aquaculture conditions

The article presents morphological and biochemical blood parameters and calculates the erythrocyte and Krebs index of sturgeon family fish - sterlet and bester, grown in the aquaculture conditions. According to the morphological composition, significant differences were found only in the number of red blood cells. Sterlet representatives had 39% more of them compared to bester. The average concentration of hemoglobin in one erythrocyte was almost 2 times higher in sterlet. There are no significant differences in the number of sturgeon leukocytes in the blood, except for eosinophils. Of all the leukocytes, lymphocytes were the most numerous (60.9 and 68.93), which indicates the lymphocytic profile of the blood in sturgeons. The Krebs index, which reflects the imbalance between different levels of immunity, was 1.5 times higher in sterlet representatives compared to Bester's peers. The analysis showed that the morphological blood parameters of sterlet and bester were within the physiological norm. According to the biochemical parameters, significant differences were recorded in the content of albumins and it should be noted that their number was small in comparison with the literature data. The de Ritis coefficient was also at the lower limit of the norm. Thus, morphological and biochemical parameters of sturgeon representatives were within the limits of reference values, which indicates good adaptive abilities of fish grown in the aquaculture conditions. It should be noted that representatives of sterlet had a higher number of red blood cells and an average concentration of hemoglobin in one red blood cell compared to bester, which in our opinion indicates a different adaptive ability of fish to conditions in water with low oxygen saturation.