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Preliminary study on the effect of 17α-Hydroxyprogesterone on main features and ovarian growth of precocious Eriocheir sinensis

SHEN Bei-jie,YANG Xiao-zhen,WU Xu-gan,CHANG Guo-Liang,CHENG Yong-xu (Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources,Shanghai Fisheries University,Ministry of Education,Shanghai 200090,China)  
Use of gonado-somatic index(GSI),the change of color of gonad and the diameter of the oocytes were employed for evaluating of the effect of 17α-Hydroxyprogesterone on main features and ovarian growth of precocious Eriocheir sinensis.The precocious Eriocheir sinensis with immature gonad(collected in Sept.,) were injected with 17α-Hydroxyprogesterone at the doses of 10-5 and 10-1 mg/g on the beginning and on the 15th day of experiment.Results showed that: no significant changes of main features(the length and width of carapace) in precocious Eriocheir sinensis were observed by administering 17α-Hydroxyprogesterone.For the precocious Eriocheir sinensis that received the high dose of 17α-Hydroxyprogesterone(10-1 mg/g),GSI and the diameter of the oocytes were increased significantly(P0.05) in comparison with the control group.17α-hydroxyprogesterone mainly induces early ovarian development.From the results,it is clear that the exogenous hydroxyprogesterone induces ovarian growth in the precocious Eriocheir sinensis.
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