越冬期饥饿对河川沙塘鳢雌鱼卵巢发育的影响
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浙江省重点科研农业项目资助 (2004C22020)


Effects of starvation on ovarian development in female Odontobutis potamophila during over-wintering period
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    摘要:

    以投喂鲜活中华米虾(Cardina sinensis)作为正常对照,对处于越冬期的雌性河川沙塘鳢(Odontobutis potamophila)进行了为期一个月的饥饿试验。至试验结束时,与对照组相比,饥饿组鱼的体重、肝体指数发生了显著(P<0.05)和极显著的下降(P<0.01);卵巢内可供继续发育形成成熟卵子的3时相中、后期卵母细胞数量骤减,卵巢整体发育程度仅到达Ⅲ期,滞后于正常投喂组的Ⅳ期卵巢,提示饥饿对越冬雌性亲鱼的性腺发育造成了不良影响。试验同时发现,饥饿组的性腺指数在28 d内未发生显著变化(P>0.05);饥饿组卵巢中卵黄脂磷蛋白的含量、肝脏中卵黄蛋白原的基因表达量及血清中的卵黄蛋白原含量都呈现出先降后升的变化趋势,其中前两项指标在28 d时分别回升到了(14.31±1.11) μg/mg和2081.08±124.86的水平,与对照组已无显著差异(P>0.05);组织切片观察发现,饥饿组卵巢中退化卵子的卵黄崩解产物被重吸收,细胞质中只剩余大量小泡。研究结果提示,饥饿状态下雌性河川沙塘鳢体内可能启动了一种性腺发育补偿机制,且该机制有多种表现形式,能使机体通过消耗自身贮能来保证子代繁殖任务的完成。

    Abstract:

    A onemonth starvation experiment was conducted to investigate its influence on the female Odontobutis potamophila during overwintering period. The control group was fed with satisfaction of living Cardina sinensis. By the end of the experiment, a significant decrease in the body weight (P<0.05) and an extremely significant decrease in the hepatopancrea somatic index (P<0.01) were observed respectively in the starving group. The percentage of the middle phase 3 oocytes and the late phase 3 oocytes which had potential to become maturation eggs soon had reduced sharply in ovaries of the starving group. And their ovaries had also developed more slowly than those phase Ⅳ ovaries of control group, just reaching middle phase Ⅲ. All those results showed the negative effects of starvation on gonadic development of female O. potamophila overwintering. On the other hand, there was no significant difference (P>0.05) found in the gonadosomatic index of the starving group within 28 d. The variations of the ovary lipovitellin concentration, the VTG gene expression in livers and the serum vitellogenin concentration of the starving group entirely showed highlowhigh trend, and in 28 d the values of the ovary lipovitellin concentration and the VTG gene expression reached (14.31±1.11) μg/mg and 2 081.08±124.86 respectively in the starving group, showing no significant difference (P>0.05) compared to the fullfed control. Resorbing and reusing evidences of the degraded yolk granules were observed in the starving fish’s ovaries. Those results suggested that there was a compensatory mechanism existing in the starving female O. potamophila, just like in some seawater fishes, to ensure reproductive success by consuming its energy deposition, and that the compensatory mechanism was characterized in several ways.

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赵晓勤,陈立侨,顾志敏,李二超,姚茜.越冬期饥饿对河川沙塘鳢雌鱼卵巢发育的影响[J].水产学报,2009,33(1):70~77

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  • 收稿日期:2007-10-26
  • 最后修改日期:2008-01-19
  • 录用日期:2008-09-16
  • 在线发布日期: 2009-01-08
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