一种代性批次产卵鱼的生殖形态生理学:从早期的卵泡发育到排卵
Omar Domínguez-Castanedo1, Cyndi G Hernandez-Coronado2, David A Martínez-Espinosa3
1Asociación Mexicana para el Estudio y Conservación de Cyprinodontiformes, Ciudad de México, Mexico.
Journal of fish biology
|August 8, 2024
概括
雌性批次产卵鱼,Gymnocorymbus ternetzi,在繁殖过程中表现出异步的卵巢卵泡发育,受雌激素 (E2) 和17α,20β-二-4-孕-3-one (17,20β-p) 的调节. 这种荷尔蒙相互作用支持多个产卵事件和对未来周期的卵泡招募.
科学领域:
- 生殖生物学 生殖生物学
- 鱼类生理学 鱼类生理学
- 内分泌学 在内分泌学.
背景情况:
- 批繁殖鱼是反复繁殖的,在多个繁殖周期中产生连续的卵子离合体.
- 了解批次产卵者毛囊发育的形态生理学和激素调节对于生殖洞察至关重要.
研究的目的:
- 在两个生殖事件之间分析卵巢卵泡发育的动态及其荷尔蒙调节的批次产卵鱼Gymnocorymbus ternetzi.
- 阐明关键荷尔蒙在生和卵泡成熟中的作用.
主要方法:
- 对雌性Gymnocorymbus ternetzi的卵巢卵泡发育的形态功能分析.
- 在生殖周期期间测量17β-雌激醇 (E2) 和17α,20β-二-4-孕-3-one (17,20β-p) 的水平的荷尔蒙测试.
- 对毛囊缩和生殖后条件因子的评估.
主要成果:
- 毛囊在16天的时间里经历了 oogenesis 阶段 (染色质核,初级,二级生长),E2 水平上升.
- 17,20β-p水平在二次生长过程中增加,与卵细胞成熟和半球分裂恢复相关.
- 在繁殖后,E2升高表明新毛囊招募,而高的17.20β-p表明 oogonia招募. 没有生殖刺激的鱼类表现出卵泡缩 (回归).
结论:
- 涉及E2和17,20β-p的荷尔蒙动态在批发发育者中编排异步的卵泡发育和成熟.
- 观察到的荷尔蒙模式促进了代产卵和有效的能量循环,通过卵泡缩,支持代性.
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