Mature oocytes at this stage, are
characterized by their large size, reaching about 425 lm. The
nuclear membrane of the mature oocyte became indistinct,
since the cytoplasm was highly packed with yolk spheroids
and yolk vesicles surrounding lipid globules, which tended to
be homogeneus acidophilic in nature. At the end of this stage,
a noticeable large number of fluid substances surround the
oocytes as an extracellular yolk. This substance penetrates
oocytes in between the yolk granules and surrounding the
nucleus. The follicle cells were rarely found around the fully
formed eggs.