Abstract
AbstractWhen the dry sperm of sea urchin, Hemicentrotus pulcherrimus, were diluted 100 times in artificial seawater, they became motile and the level of ATP decreased. However, after dilution in Na+‐free seawater, the sperm were still immotile and the ATP level remained constant. CoA, carnitine, and their derivatives as intermediates of lipid metabolism were also measured in sperm. The levels of CoA derivatives were much higher than those of carnitine derivatives. The free and acid‐soluble CoA level decreased and the long‐chain acyl‐CoA level increased after dilution in artificial seawater, However, they did not change after dilution in Na+‐free seawater. The levels of carnitine derivatives hardly changed after the dilution in both sorts of artificial seawater, The respiratory rate was extremely low in Na+‐free seawater, Furthermore, concentrations of pyruvate, lactate, citrate, and malate remained essentially constant after dilution in the Na+‐free seawater, whereas they changed markedly after dilution in the artificial seawater.
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