Growth，sexual hormone levels in serum and gonadal development in barbell Luciobarbus capito
WANG Si-ze1，2，ZHANG Ying1，GENG Long-wu1，JIANG Hai-feng1，XU Wei1
1.Heilongjiang River Fisheries Research Institute，Chinese Academy of Fishery Sciences，Harbin 150070，China；2.College of Fisheries and Life Science，Shanghai Ocean University，Shanghai 201306，China
Abstract: The growth，gonadal development and serum sex steroids level in 1-5 years old cultured barbel Luciobarbus capito were investigated using morphological，histological and biochemical methods to study the growth characteristics，and relationship between gonadal development and sex steroids level.The results showed that body length（L）and body weight（W）were shown to increased significantly with age，with body length-weight relationship as W=0.012L2.99（R2=0.99），and Von Bertalanffy growth equation Lt=107.43［1-e-0.15（t+0.067）］and Wt= 12939［1-e-0.15（t+0.067）］2.99.There was lower level of serum testosterone（T）in 1-5 years old males than that in 1-4 years old females，with the maximal value（1.12±0.81）ng/mL at age of 5 years old.The maximal level （713.00 pg/mL±424.89 pg/mL）of 17β-E2was observed in 5 years old females，without significant difference among the other groups.The Leydigs cells，sertolis cells and spermatangia were distributed in the seminiferous lobules of the testis as a typical lobular structure.Spermatic development was divided into five stages，spermatogonium，first spermatocyte，secondary spermatocyte，spermatoblast and mature sperms，with the maximal gonado-somatic index（GSI）（0.83%）in 5 years old males.The ovary development was divided into five stages，with GSI from 0.51%to 8.90%，and the peak value of 8.90%at stageⅤ，one year early maturation in male than in female，4 years old at maturity in male and 5 years old at maturity in female.
2016, Vol. 31 
