Abstract
Eggs and sperm obtained from breeder roaches Rutilus rutilus were exposed, prior to activation with water, for 25 minutes to the main phase of a strong magnetic storm. Such exposure increased the proportion of stages completing mitosis during the cleavage of blastomeres and an increase in the variation of the mitotic index. No changes in the frequency of chromosome aberrations were revealed in experimental embryonic cells compared to control cells. The rate of hatching, survival of embryos, and size and mass parameters of prolarvae varied in experimental and control samples, but no link of this variation with exposure to a magnetic storm has been established.
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