Serum biochemical parameters are important aspects in the management of endangered species, such as Acipenser persicus. The values of these parameters can be used for confirming the maturity and for monitoring any changes in the quality of waters and related soils. Serum samples of 44 A. persicus fishes were analyzed and their serum parameter values were determined as Mean+/-SD in four groups: mature males and females and immature males and females, respectively. We compared the levels of calcium (Ca; 1.97 +/- 0.31-2.38 +/- 0.28 mmol/l), blood urea nitrogen (BUN; 4.4 +/- 0.54-6.16 +/- 0.63 mmol/l), cholesterol (CHO; 2.55 +/- 0.42-13.51 +/- 0.65 mmol/l), creatinine (CREA; 27.23 +/- 3.5-83.98 +/- 7.5 mmol/l), magnesium (Mg; 2.74 +/- 0.18-3.05 +/- 0.46 mmol/l), bilirubin (Bilirubin; 2.05 +/- 0.42-13.93 +/- 4.39 mumol/l), aspatate transaminase (AST; 18.25 +/- 1.5-167 +/- 38 Iu/l), alanine transaminase (ALT; 11 +/- 1-25.33 +/- 9.24 Iu/l), alkaline phosphatase (ALP; 183.5 +/- 17.68-523 +/- 66.23 Iu/l) and creatine kinase (CK; 157.5 +/- 27.58-2132.2 +/- 250.92 Iu/l). We have shown that there were no differences in the Ca and Mg levels among the different groups. However, mature females have higher CREA, AST, CHO and lower BUN, ALP and ALT than the immature females. In the mature males, the values of ALP and bilirubin were higher yet the values of CREA and ALT were lower than in the immature males.