Due to the imperfect processing and utilization technology, most of the current catches are mainly primary processing and fresh marketing. If the by-products are not disposed properly in this process, they will not only waste valuable resources, but also cause serious environmental pollution. Optimizing the use of these by-products, especially for the preparation of high value-added products, can effectively reduce costs and improve producers' income.

By-products of the catch, which can be formed into fishmeal and fish oil by grinding, cooking, pressing, and separating.