运用透射电镜观察了莫桑鼻给非鲫卵母细胞内卵黄球的结构；
The yolk spheres of Tilapia mossmabica have been studied by transmission electron microscopy.
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胚胎卵黄囊表面有一个大圆形油球。
There is a big oil ball on the surface of yolk-sac of perch.
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