The sensory characteristics of pure fish meal are generally yellowish brown or yellowish brown. Due to the difference of fish species, there are also a small amount of white fish meal, gray fish meal, etc. it has the smell of cooked and roasted fish, and has a slight smell of fish oil. The fish meal is powdery, containing small phosphorus flakes, fish bones, etc. the well processed fish meal can be seen as shredded meat. 2, The surface of fish is rough and has fiber