Abstract
ABSTRACT A comparative study of the yolk nucleus in the oocytes from 8 species of fishes has been carried out. The yolk nucleus appears as a mass of lipid granules and mitochondria situated beside the nucleus. It becomes spherical, detaches itself from the nucleus, and migrates to the peripheral region of the cytoplasm to lie just below the cell membrane. During the migration, the lipid granules of the yolk nucleus grow and move out of this organelle. When the oocyte is about 180/x in diameter, the yolk nucleus breaks up and its components are dispersed in the cytoplasm. No differences have been found in the morphology of the yolk nucleus in the species under investi- gation.
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