Abstract
1) Yolk protrusions into the plasmic layer covering the yolk were observed in sections prior to the blastula stage of a fresh-water teleost, the medaka, Oryzias latipes. 2) The phenomena are observed soon after the fertilization in the peripheral region of the plasmic layer and then the yolk material protruded is dislocated centripetally towards the central axis of the egg. This may be caused by the plasmic stream for the accumulation. 3) They are not observed at all at the 32-cell and the 64-cell stages and also no yolk material is visible in the plasmic layer. This suggests the conversion of the yolk to some other invisible materials, that is, the digestion. 4) In the morula and the blastula stages, they are observed both in the marginal and the subgerminal periblast. 5) Some sort of plasmic movement is suggested as a cause of this protrusion and further studies are expected.
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