| 摘要: |
| 乌苏里拟鲿(Pseudobagrus ussuriensis)的种质资源保护和商品鱼养殖正在我国悄然兴起。本文首次研究了乌苏里拟鲿雌、雄鱼在池塘养殖条件下的生长规律以及性成熟鱼周年性腺发育与性激素变化特性。研究结果表明, 乌苏里拟鲿随着年龄的增长, 雌鱼和雄鱼之间的体质量、体长差异逐渐明显, 雌鱼体长与体质量的关系式为: W=0.182 5L1.964 6(R2=0.944 5); 雄鱼体长与体质量的关系式为: W=0.188 1L2.0059(R2=0.961 8)。在12 月份(2 龄鱼)至翌年10 月份(3 龄鱼)期间, 雌、雄鱼丰满度呈下降趋势,成熟度、血清雌二醇(E2)和睾酮(T)水平均呈先升高后下降的变化规律。雌鱼的E2和T 在5 月份达到最高值, 分别为(1 624.23±331.4) pg/mL 和(1 320.85±279.12) pg/mL; 雄鱼的E2在5 月份达到最高值(323.17±147.36) pg/mL, 而T 的最高值则出现在4 月份, 为(758.33±100.47) pg/mL。雌、雄鱼性腺发育和成熟度基本同步, 从外观和组织学观察对性腺的分期显示, 2 龄乌苏里拟鲿在12 月份的精巢和卵巢已发育至第Ⅲ期, 在次年6 月份均达到第Ⅴ期。 |
| 关键词: 乌苏里拟鲿(Pseudobagrus ussuriensis) 生长 成熟度 性激素 性腺 |
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| 基金项目:江苏省科技厅科技支撑项目(BE2009340); 苏州市科技局科技支撑项目(SNG0912) |
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| Growth and seasonal changes of sex steroids level and gonad development in female and male Pseudobagrus ussuriensis |
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| Abstract: |
| The protection of germplasm resources and aquaculture of Pseudobagrus ussuriensis are receiving more and more attention in China. The growth and seasonal changes of sex steroids level and gonad development in female and male P. ussuriensis were analyzed. The results showed that the differences in weight and length of female and male P. ussuriensis were increased with growth of age. The relationship formula of weight and length for female and male fishes were W=0.182 5L1.964 6(R2=0.944 5) and W=0.188 1L2.0059(R2=0.961 8), respectively. Our result showed that the relative fatness was kept going down from December (2-year old fish) to the next October (3-year old fish). The gonad maturity, 17β-estradiol (E2) level and testosterone (T) were all firstly increased and then decreased, and the E2 and T values in female P. ussuriensis were both reached the peak values in May, which were (1624.23±331.4) pg/mL and (1320.85±279.12) pg/mL respectively. The male’s E2 level also reached the highest level (323.17±147.36) pg/mL in May, and the T value was increased to the highest level (758.33±100.47) pg/mL in April. The gonadal development was synchronized with gonad maturity in both male and female fishes. The gonad was developed at the third phase in December and at the fifth phase in June. |
| Key words: Pseudobagrus ussuriensis growth gonad maturity sex steroids gonad |
