| 摘要: |
| 黑鲷(Acanthopagrus schlegeli)为具性逆转的珍贵海产鱼类, 其个体在第3龄期雄性转为雌性, 但性逆转发生的详细过程尚不清楚。为了解黑鲷性腺逆转发生的过程, 作者通过对池塘养殖黑鲷3～4龄期个体进行定期跟踪取样观察, 结合组织切片显微检测性腺变化过程。结果显示: 黑鲷性腺在繁殖前后变化趋势不同; 繁殖期雌性个体约占15%; 繁殖后至7月份是性腺由雄逆转为雌主要时期; 8月份全部个体性腺外观表现为卵巢形式; 到9月底, 个别性腺的精巢组织又开始发育; 到12月底样本性腺有雄性、雌性及雌雄同体同时发育3种形式。此外, 分析了黑鲷性腺成熟系数与肝质量系数的周年变化趋势。研究获得了详细的3～4龄黑鲷性逆转发生过程及性逆转结果, 并针对与先前报道的有关研究结果差异展开分析, 为掌握不同海区黑鲷性逆转特性及育种研究提供了更多资料, 也为雌雄同体鱼类资源利用研究提供新的参考依据。 |
| 关键词: 黑鲷(Acanthopagrus schlegeli) 雌雄同体 性逆转 性腺系数 肝脏系数 |
| DOI：10.11759/hykx20161214005 |
| 分类号: |
| 基金项目:江苏省水产三新工程重大项目(D2015-17); 南通市应用基础研究计划(MS12015071, MS12015070) |
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| Histological observation of sex change in the cultivated black porgy, Acanthopagrus schlegeli |
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CHEN Shu-yin,ZHANG Zhi-yong,LIU Hai-lin,XU Jin,ZHU Fei,JIA Chao-feng,ZHANG Zhi-wei,REN Zhong-hong
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| Abstract: |
| The black porgy, Acanthopagrus schlegeli, is a popular and commonly farmed fish that undergoes a male-to-female sex change at 3 years of age. However, the process by which the black porgy changes sex remains unclear. In order to determine this process, the gonadal development and sex change of A. schlegeli at the 3–4 year mark was studied by collecting samples regularly and analyzing samples with histological methods. Results showed that in bisexual gonads, the testicular tissue developed more predominantly, and some oogonia and primary oocytes remained in the smaller ovarian tissue from January to May. Approximately 15% of 3-year-old black porgy were females during the spawning season. The testicular tissue then began to regress and ovarian tissue started to grow after the spawning periods (June–July), with full regression of the testis accompanying the development of vitellogenic oocytes . The trend survey of the gonad dissection showed that the testicular tissue began to grow gradually at the end of September, and remained up in November and December in a subset of fish 3 years of age and older. There was an equal distribution of fish with bisexual gonads, ovaries, and testicles (each group accounted for one third of the sample population) by the end of December. In addition, annual changes in the gonado-somatic index and hepato-somatic index were analyzed. This study outlines the natural sex change process of A. schlegeli, and may provide guidance on breeding research for hermaphrodite fish. |
| Key words: Acanthopagrus schlegeli hermaphrodite sex change gonado-somatic index hepato-somatic index |
