The full grown mother of pearl ware used in the experiments of fertilization. Artifi-cial fertilization was operated in the 0. 07% ammonia sea water. High rate of fertilizationwould be obtained, when the water temperature is 25--29℃. The fertilized eggs developto trochophores in 5. 5 hrs., Under the water temperature of 28℃ and the specific gravityof 1. 0227. Twenty days later the larvae begin to be attached and turn to benthic habitat.The experiments indicate that Platymonas and yeast being used to feed the larvae seempreferable