Show japanese pearl oyster farm japan has a pearl oyster farm in the day bay of ago there has been established a plantation from which a rich harvest la is obtained in may or june stones weighing from six to eight pounds are sunk in shallow water and in august the tiny shells begin to appear on them the stones remain in for two months but since the young oysters cannot endure cold in november all rocks in less lhnn five feet of water farther out achere the temperature Is more even at the end of three years when tho the shells are about two inches across they are taken from the water ducle nuclei tor for pearls inserted in them and replaced in the water SO 30 of them to every six square feet of bottom there they era ara left for four years then being seven and a half years old they are removed and searched tor for pearls |