Examination of Some Biochemical Factors of Blood Serum in Beluga (Huso huso) Cultured in Brackish Water

Blood indexes are very important in fish physiology, the more knowledge of blood indexes of fishes, the more ability of breeding and culturing of them. We conducted an experiment on some 4-5 years old great Sturgeon fishes to examine the effect of brackish water ponds as a new condition as well as the sex and seasons on its blood serum biochemical factors. Since they are very precious species and their stocks are getting reclined in their inhabits, understanding the changes as a result of inhabiting in a different environment will be useful to improve breeding programs for restocking and expanding artificial culturing areas. The examination was done in the Brackish Fishery Research Station Bafgh during one year. Blood sampling was performed in caudal vein once in every three month and serum was separated with centrifuge machine. Glucose was measured with authoanalyser, calcium and magnesium with spectrophotometer and sodium and potassium with flame photometer. No significantly effect between sexes (P>0.05) was detected and shows it was not depended on sex, in contrary to sexes, the season changes had significant effect (P<0.05). All of the parameters were the highest value in spring (with the exception of magnesium in summer) and the lowest of glucose and calcium value was in fall, and sodium, magnesium and potassium in winter, So we could claim that temperature changes as a result of season transition may have an important role on blood parameter changes. Blood parameters in different species of sturgeons are different. Sexually had no effect on blood parameters. Important factor on blood serum of beluga was salinity and ion concentration in their living environment.