By products from the marine transformation industries, such as viscera, heads, trims, bones, cartilage, tails, skin, scales, blood, shells, carcasses, damaged fish, eggs, milt, or soft roe, present an excellent chance for purposing into extremely valuable goods. Their classification decides which form of value creation is most appropriate and effective among the options available, fishmeal, silage, and hydrolysates are produced, as are oils high in Polyunsaturated Fatty Acids (PUFAs), as well as vitamins, enzymes, minerals, gelatin, collagen, chitin and chitosan, taurine and creatine, hydroxyapatite, natural colours, biodiesel, and biogas.