Aquatic feed must be finer crushed to meet the needs of animal digestion and granulation requirements. The appropriate fineness of grinding is affected by the growth stage of animals, nutritional requirements and feed processing technology and equipment. Reasonable selection of grinding fineness is also an inevitable requirement for reducing costs, improving production capacity and ensuring product quality.

The digestive tract of aquatic animals is short, in order to speed up digestion and absorption, aquatic feed should be smaller than the grinding grain of livestock and poultry feed, such as the production of eel and prawn feed, its grain size should reach 80 to 120 mesh. In addition, the aquatic animal compound feed has high protein content and low carbohydrate content, and the feed particle structure is tight, requiring high adhesion and water resistance.