Induction of Larval Settlement and Metamorphosis of Coelomactra antiquata Using Ca~(2+) and K~+

The settlement and metamorphosis of the larval of Coelomactra antiquata treated with Ca2+ and K+.The results indicated that the hightest settlement and metamorphosis rates of was carried out.Component larval were observered in Ca2+ concentration of 20 mmol/L,the settlement rate was 86.1% and the metamorphosis rate was 42.8%.The hightest settlement and metamorphosis rates of component larval were observered in K+ concentrations of 10 mmol/L,the settlement rate was 83.7%,the metamorphosis rate was 33.5%.Ca2+ can induce the larval settlement and metamorphosis of Coelomactra antiquata more effectively than K+.