Abstract
Mantle pieces of Mvtilus edulis were bathed for 10 minutes in M/2 aqueous solutions of KC1, NH4C1, NaC1, LiC1 and in M/3 solutions of BaCl2, SrCl2, CaCl2 and MgCl2 respectively. Of all these chemicals, KCl, NH4Cl and B3Cl2 induced the spawning, while the others did not. K, NH4 and Ba ions have higher mobility, therefore they must have higher permeability through the cell membrane than the other ions. In exchange with such cathions penetrated into the cells of ovary, H ion, possessing the highest mobility among the cathions, may go out of the cell. When the cells interior may become alkaline, the spawning may be induced.
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