On promoting maturity of ark shell by controlling water temperature

It was the first time to have researched the mature conditions for promoting maturity of the sexual gland of the ark shell by controlling water temperature. In the middle ten days of March, the parent ark shells were released into the pond which water temperature was controlled. After 25 similar to 28 days of intensive cultivation, their sexual glands developed to maturity, and the parent ark shells began to spawn eggs and ejaculate sperms, 3 months earlier than the adult ark shells in the natural waters. The sexual gland developed fastest at the water temperature above 16 degree C.