在受精后大约六七个星期时，男性和女性胚胎之间没有什么差别。
For about six or seven weeks after conception, there is no differentiation between male and female.
卵细胞受精后则要经过较长的休眠期。
热休克和水静压刺激在各组硬头鳟卵受精后25分钟开始施行。
Thermal of hydrostatic pressure shocks were administered 25 min post—fertilization to groups of stcelhead trout eggs.
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