The extrusion process is used for production of fish feed with great superiority in comparison with other technologies. The functions of different equipment are integrated in a single process when extruding. Mixing, extruding, cutting, cooking, and drying are carried out simultaneously. This operation is very effective for high-temperature and short-period processing. It also provides a better nutrition improvement, and effectively reduces different anti-nutritional factors in products and sterilizes them.

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