1, in general, the quality of large individuals with fleshy meat is good, and the quality of small individuals with thin meat is poor.

2, the shape is neat, the abdominal cavity is intact, the quality is good, and the quality of the abdominal cavity is not cut open.

3, irregular shape, bright color and good quality; Poor quality with dull or dull color.

4. The quality with extremely light salt taste is good, and the quality with heavy salt taste is poor.

5, smell no odor, good quality, odor, poor quality.

6, dry texture, water content below 15%, good quality, wet and soft texture, poor quality.