The yolk nucleus in the freshwater teleost Garra gotyla gotyla (Gray).
The structure and functional significance of the yolk nucleus in Garra are described. The study shows that the yolk nucleus appears in the cytoplasm of the early perinucleolus stage of the oocyte. It is present as a deeply stained structure enclosed in a vesicle. It disappears in the yolk vesicle stage and vitellogenesis begins soon afterwards. This probably indicates that it plays a role in the initiation of vitellogenesis. When yolk formation starts, the yolk nucleus disappears; this also suggests that it is of functional significance in yolk synthesis.
Sahai
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Bannatwala
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D000818:Animals; D004530:Egg Yolk / Q000032:analysis*; D005260:Female; D005399:Fishes / Q000033:anatomy & histology*