Evaluation of some hematological indices of Beluga (Huso huso) cultured in Caspian Sea during different seasons

The aim of this study was to evaluate the effect of seasonal variations on some of the hematological and serum biochemical parameters on some 2-3 years' old great sturgeon cultured in brackish water pens for yearlong from autumn 2015 to summer 2016. At different seasons, after anesthetizing the fish with clove extract, blood sampling was done, from a total of 15 great sturgeon specimens were apparentlyat healthy condition in 3 separately pen's. Blood samples was analyzed by the routine method used in fish hematology. There were no significant differences in amount of the cortisol, mean corpuscular volume (MCV) and activity of Alanine aminotransferase (ALT) in the different seasons (p>0.05). The maximum WBCs, Activity of aspartate aminotransferase (AST) and alkaline phosphatase (ALP) were observed in summer (p<0.05).  </span>The maximum RBCs, hematocrit concentration, total serum protein were observed in spring (p<0.05). The maximum hemoglobin concentration, the mean corpuscular hemoglobin (MCH) and the mean corpuscular hemoglobin concentration (MCHC) were observed in autumn (p<0.05). The maximum level of glucose was observed in winter (p<0.05). In conclusion, the result of this study showed that the changes of temperature as a result of season transition may have an important role in the blood parameters of H. huso</em>, resulting that, at the same ecological conditions, any changes in environment temperature, in the water, affecting the blood cells indices in Beluga.</span>