PROBLEM TO BE SOLVED: To provide oysters of a high quality, without the anxiety of virus or bacterial contamination, which are high in safety and which have a high freshness and a high nutrition value.SOLUTION: In a method for performing the husbandry of oysters by using ocean deep water, oysters in a water bath are cultivated by flowing ocean deep water thereto at a temperature of 8 to 18°C for 12 to 72 hours to the oysters in a water bath.SELECTED DRAWING: None