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[Effect of centrifugation on the early embryogenesis of the teleost Brachidanio rerio].

The early embryogenesis of the teleost Brachidanio rerio has been shown to be resistant to centrifugation. Beginning with the blastula stage, the development proceeds normally in 90% embryos centrifuged at 500 g for 1 h. Beginning with early developmental stages, embryos grow and develop normally when exposed to long-term centrifugation at 50 g. The exposure produces partial inhibition of cytotomy (with nuclear division continued). This effect changes the proportions of the cellular and syncytial fractions of the embryo (blastoderm and periblast). The exposure to centrifugation also reveals the dorsoventral asymmetry of egg surface tension. Resistance to centrifugation is attributed to the fact that the polarization control is beyond the cell embryonic fraction.