Correlation between Serum Steroid Hormones and Some Biological Characteristic of Gonad in Acipenser ruthenus and Acipenser baeri

The correlation between serum steroid hormones, testosterone (T), 17β-estradiol (E2), and progesterone (P) and weight of female fishes, biological characteristics of gonad (e.g. fertilization rate, fluid egg rate, gonadosomatic index , polarization index and oocyte diameter) in 10 female of the migratory population of Sterlet (Acipenser ruthenus) and 5 female of the migratory population of Siberian sturgeon (Acipenser baeri) in Spring of the 2012 were determined. In Sterlet, significant negative correlations were observed between 17-β estradiol and polarization index (P