To provide a production method for granulating oysters and fishery products without making an explosive noise like a puffed cereal producing machine when a granulation is performed by reducing the pressure from high-pressure to low-pressure.SOLUTION: In the production method, appropriately heated oysters and fishery products 14 that have appropriate humidity are instantaneously moved from a high-pressure kiln 1 to a low-pressure kiln 2, then the air expands, and the tissue of the oysters and fishery products 14 expands and foams due to the pressure difference, intakes the air between cells, and is granulated. In that case, the air mixing occurs in the integrated structure in which the high-pressure kiln 1 and the low-pressure kiln 2 are linked, so that the explosion noise can be reduced.SELECTED DRAWING: Figure 1【課題】牡蠣及び魚貝類を高圧から低圧に減圧することで顆粒化行う際に、ポン菓子製造機のような爆音を出さずに顆粒化する方法を提供する。【解決手段】適宜に加熱し、適宜な湿度の、牡蠣及び魚貝類１４を、空気圧が高圧の加圧窯１から、空気圧が低圧の低圧窯２に、瞬時に移動させることで、空気の膨張に伴い、牡蠣及び魚貝類１４は気圧差で組織が膨張して発泡し、細胞間に空気を取り込み、顆粒化する製造方法で、空気の混合は、加圧窯１と低圧窯２が連結構造の一体化構造の中で起こるために爆音が小さい事を特徴とする。【選択図】図１
