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The cortical layer development of the oocytes of the oviparous teleost fishLutjanus synagris (Linnaeus) were investigated by light and electron microscopy. In stage I the young oocytes and the follicle cells are in contact with each other. During the early growth period, microvilli cover the surface of the oocytes. In the early stage II, patches of electron dense homogeneous material for the cortex are deposited between the microvilli. In stage III the cortical layer differentiates into a cortex radiatus externus and a cortex radiatus internus. Just before ovulation in stage IV the cortex radiatus externus is strengthened by further differentiations. The transport of material from the egg to the follicle cells and vice versa is probably mediated by pinocytosis. Cytoplasmatic links at the points of contact between microvilli and the branches of the follicular cells could not be observed.

Light and electron microscopic studies of the envelopes in egg cells of the marine teleost fishLutjanus synagris