1, shape difference. Chlamys farreri's shell is fan-shaped, symmetrical, slightly convex and light, which is very suitable for fast swimming and shaped like a skirt. The adductor muscle is often divided into two parts, which are used to control the movement of the two shells, while the scallop is mainly round, with a thin and hard shell, a round trailing edge and a grayish brown shell.

2. Different origins. Chlamys farreri is mainly produced in the United States and Canada, and now it is also distributed in the Bohai Sea, the Yellow Sea and the coastal areas of Liaoning. From the origin, it is mainly sunny and warm sea water, which is suitable for the growth and reproduction of Chlamys farreri. However, Chlamys farreri is distributed in the coastal areas of Japan and other places, with high seawater salinity and low reproduction rate.

3. Differences in nutritional value. Chlamys farreri contains a lot of amino acids, vitamins, riboflavin, iron, calcium, magnesium and other nutrients. After eating, it can prevent cardiovascular diseases, resist bacteria and enhance human resistance. There are few nutrients in bay scallop, mainly protein, vitamins, sodium, magnesium, zinc and selenium, which have the functions of resolving phlegm, clearing heat, nourishing yin and tonifying kidney.