Expanded feed is a kind of expanded porous feed which is obtained by sudden depressurization of pressure after high temperature and high pressure of the extruder.
Pellet feed is generally the pellet feed extruded by the pressing roll of the granulator, which is generally cylindrical in shape.
Extruded feed and pellet feed can be used as fish feed. Extruded feed has better effect because of its good palatability and high digestibility, but its price is much more expensive. General freshwater fish can be fed with pellet feed, while special high-grade fish can be fed with extruded feed.