NOVELTY - An aqueous solution of fishery waste material is hydrated and heat-stirred, and foreign material is removed. Waste material and culture solution containing lactobacillus and yeast are heated and oil component is extracted. Fermentation of oil component-free waste material is performed and heavy metal is removed. Water is extracted from resulting waste material by centrifuge method. Thus, useful substance is extracted from the waste material.    USE - For extracting useful substance from fishery waste material such as internal organ of octopus, squid and scallop. Useful substance is used as raw material of foodstuffs, and nutrient component of mineral or vitamin.    ADVANTAGE - The useful substance such as oil component and water is efficiently and economically extracted from the fishery waste material, by consuming less amount of energy and without affecting the environment. The useful substance has excellent health maintenance function such as immuno activity improvement and infection protecting property. The extracted oil component is effectively utilized as high quality functional lipid. The generation of putrefying bacteria and odor, at the time of oil component extraction, are effectively suppressed.    DETAILED DESCRIPTION - An aqueous solution of fishery waste material is hydrated and heat-stirred, and foreign material is removed from the fishery waste material. The fishery waste material and culture solution containing lacto bacillus and yeast, are heated at temperature at which the yeast and lactobacillus in a culture solution do not become extinct, and oil component is extracted by centrifuge method. The oil component-free fishery waste material is subjected to fermentation process, and heavy metal is removed. Water is extracted from the fishery waste waster by centrifuge method. Thus, the useful substance is extracted from the fishery waste material.    DESCRIPTION OF DRAWING(S) - The figure shows the flowchart of extraction process of useful substance from fishery waste material. (Drawing includes non-English language text).