在F1代化场生产的大珀 (Seriola dumerili) 中,青春期的时间
Stefano Lancerotto1, Ioannis Fakriadis2, Maria Papadaki2
1Institute of Marine Biology, Biotechnology, and Aquaculture, Hellenic Centre for Marine Research, P.O. Box 2214, Heraklion 71003 Crete, Greece; Biology Department, University of Crete, PO Box 2208, 71409 Heraklion, Crete, Greece.
General and comparative endocrinology
|November 26, 2023
概括
化场生产的大珀 (Seriola dumerili) 雄性成熟良好,但雌性比野生种群晚成熟. 在育种群中诱导产卵是无效的,这表明在化场生产的大珀鱼中存在潜在的功能障碍.
科学领域:
- 水产养殖和渔业科学 水产养殖和渔业科学
- 生殖生物学 生殖生物学
- 海洋生物学 海洋生物学
背景情况:
- 第一代 (F1) 大珀 (Seriola dumerili) 的养殖越来越多.
- 了解青春期的开始对于成功的繁殖管理和水产养殖生产至关重要.
- 之前对化场生产的大珀的繁殖成熟度的研究是有限的.
研究的目的:
- 为了评估在海中养的化场生产的大珀 (Seriola dumerili) 青春期的开始.
- 为了比较化场生产的鱼类与野生种群的繁殖成熟度.
- 评估GnRHa治疗在育种动物中诱导产卵的有效性.
主要方法:
- 大珀鱼在海中养五年,在产卵季节每年抽取样本.
- 卵巢发育和胚胎生成被组织学评估.
- 测量了生殖类固醇 (,雌激素,17,20β-P,11-KT) 的血水平.
- 评估了精子的运动性.
- 用GnRHa植入物来评估产卵反应.
主要成果:
- 雄性大珀在1-2岁时表现出体育生殖,在3岁时100%产生可活的精子.
- 雌性表现出延迟成熟,显著的卵泡缩观察到5岁.
- 血类固醇配置文件表明未成熟和成熟的女性之间的差异,以及男性丸激素的下降.
- 在男性中,从4岁起,精子运动性得到改善.
- 在5岁的鱼类中,GnRHa治疗导致产卵有限,没有受精卵.
结论:
- 化场生产的雄性大珀在与野生种群相似的时间框架内成熟,但有较小的生殖腺.
- 与野生同类相比,雌性大珀表现出延迟的性成熟和减少的生殖腺大小.
- 治疗GnRHa的无效性表明在地中海化场生产的大珀子育种群中存在潜在的功能障碍,这需要进一步调查.
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