Oct 15, 2020 · Process the Feed Mash in a Pellet Machine: The fish feed mixture is put into the fish feed extruder so that it can be processed into pellets. The size of the pellets will depend on the size of the fish that wants to be feed. Fish Feed Extruder. Dry the Fish Feed Pellets: After granulated mash is formed, it is then dried in a fish feed dryer to