Effect of Temperature on the Artificial Propagtion of Persian Sturgeon (Acipenser persicus)

222 prespawning adult Acipenser persicus including 178 female and 44 male were sampled for studying the effect of temperature on the artificial breeding in the southeast of the Caspian sea during march 2000 – May 2001. The samples breeded in the shahid Marjany, sturgeon breeding and propagation center in Gorgan. In this study, the effect of temperature on fertilization percentage, the time of female sex ripering, positive feedback of broodstock to injection of pituitary studied. To study the effect of temperature on fertilization percentage, the time of female sex ripering, temperature groups divided into three groups and also to study the effect of temperature on the positive feedback of broodstock to injection on pituitary the temperature groups were divided into four groups. The highest fertilization percentage observed in 16.1-18°c. Increasing the temperature declined the time of female ripering of sexual maturity and positive feedback to pituitary injection