ELECTRON MICROSCOPIC OBSERVATION ON THE YOLK-SPHERE CRYSTALS OF Tilapia mossambica
莫桑鼻给非鲫卵黄球结晶体的电镜观察

The yolk spheres of Tilapia mossmabica have been studied by transmission electron microscopy. The structure of yolk sphere can be distinguished into three main parts: limiting membrane; central crystalline body or bodies and non-crystalline area. The yolk-sphere crystals possess an orthorhombic lattice and the lipovitellin molecular particles in the crystalline body are arrayed in pseudohex-agonal pattern. The mechanism of formation and biological significance of the yolk-sphere crystals are also discussed.