[The ionic permeability of cytoplasmic membranes during early carp (Cyprinus carpio L.) embryogenesis]

Membrane potentials (MP) of the early embiogenesis in Cyprinus carpio L. were studied. It is determined that during cleavage of the egg cell MP increases from 8.3 +/- +/- 2.1 mV (non-cleaving fertilized egg cell) to 47.5 +/- 4.1 mV (stage of the microcellular morula). The influence of sodium ions on MP gradually decreases. On the contrary, the influence of potassium ions grown considerably. Potassium ions play the main part in formation of embrionic cells MP in the carp.