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Concentration of sexual steroid hormones in blood plasm of sturgeons during marine life period at different state of their gonads


, : Concentration of sexual steroid hormones in blood plasm of sturgeons during marine life period at different state of their gonads. Voprosy Ikhtiologii 40(2): 269-274, March-April

The concentrations of testosterone, estradiol 17beta, and progesterone were studied in the blood plasma of Acipenser gueldenstaedtii. A. stellatus, and Huso huso in the northern part of the Caspian Sea in the spring, summer and fall of 1994-1997. It was found that in the species studied, blood level of estradiol significantly increased and testosterone concentration tended to increase at the beginning of a successive wave of gametogenesis (II-III stage of gonadal maturity). A more significant increase in testosterone level was observed in the sturgeons during the III-IV stages of gonadal maturity. Apparently, this phenomenon is associated with the regulation of reproductive function, as well as preparation for migration. Testosterone and estradiol concentrations decreased in both males and females with disturbances of gonadal function affecting their sexual behavior. It was concluded that the dynamics of sex hormones in the majority of the fishes studied was characteristic of the normal regulation of reproductive function.

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