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首页> 外文期刊>African Journal of Aquatic Science >Ovarian activity and plasma sex steroid levels of Distichodus antonii in relation to environmental conditions in the upper basin of the Congo River
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Ovarian activity and plasma sex steroid levels of Distichodus antonii in relation to environmental conditions in the upper basin of the Congo River

机译:卵巢活动和血浆性类别类动物水平与刚果河上部盆地的环境条件相关

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摘要

Distichodus antonii is an endemic fish species of the Congo River basin in which the stocks of wild populations are threatened by overfishing pressure. Knowledge of its reproductive biology would be useful in consideration of conservation and management options for the species. Therefore, this study investigated changes in ovarian activity and levels of steroid profiles in wild populations in relation to variation in temperature and rainfall. Adult females (n = 101, body weight of 3 183 +/- 14.75 g, SE) were captured monthly over one year (2013-2014). Apart from evaluation of oocyte diameters and gonad developmental stages, gonado-, hepato-, lipososomatic indices (GSI, HSI, LSI) and plasma levels of sex steroids (testosterone-T, estradiol-17-E2) were determined. The results suggested a synchronous development of oocytes with two annual reproductive seasons over the one-year study. Plasma T and E2 levels peaked during spawning periods likely reflecting active oogenesis. The highest values of morphosomatic indices were observed during the longest rainfall period in September, and were associated with high steroidogenic activity evidenced by increased E2 production. In addition, more vitellogenic oocytes (September and October) were observed during the latter season than during the short rainy season (in May).
机译:Distichodus Antonii是刚果河流域的地方鱼类,其中野生种群的股票受到过度捕捞压力的威胁。对其生殖生物学的了解,考虑到物种的保护和管理选择是有用的。因此,本研究研究了与温度和降雨的变化相关的野生群体中卵巢活动和类固醇水平的变化。成年女性(n = 101,每月3183 +/- 14.75克,SE)捕获了一年(2013-2014)。除了评估卵母细胞直径和Gonad发育阶段,测定性类固醇(睾酮-T,雌二醇-17-E2)的雌性,肝,脂质索引(GSI,HSI,LSI)和血浆水平。结果表明,在一年的研究中具有两个年度生殖季节的卵母细胞同步发育。在可能反映活性OECOIRY的产卵期期间峰值峰值和E2水平达到峰值。在9月的最长的降雨期间观察到了种类索引的最高值,并且与E2产量增加所证明的高性能活性相关。此外,在后一个季节期间观察到比在短暂的雨季(5月)的季节中观察到更多Vitellogenic卵母细胞(9月和10月)。

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