Jul 1, 2023 · Making Fish Food for Tilapia by Fish Feed Machine – Fish . Get Price Now! In short, the fish feed extrusion process requires a hammer mill to grind the raw materials, the mixer mixed raw materials include vitamin mineral premix and the wet fish feed extruder’s steam preconditioner and cutter head shape pellets, and finally dryer-cooler to ensure the shelf life and stability of the granules..