The present invention relates to a method for preparing granules for a fish feed or an assorted feed aid, and more particularly, a method for preparing organic coating porous granules for a fish feed or an assorted feed aid using the blood of livestock and clay minerals. The present invention is to provide granules for a fish feed or an assorted feed aid, wherein the granule contains useful minerals, such as zeolite and bentonite, suitable to be used for a feed, and includes an organic coating layer mainly composed of proteins formed on a surface of the granule by using the blood (let blood) of livestock, so that the time while water infiltrates into pores inside the granule mainly composed of inorganic substances is delayed, thereby obtaining having excellent fluidity.