1. Appearance: the shell of Rushan oyster is relatively flat, oval or oval, gray or brown in color, with raised longitudinal ridges on the surface; Oyster shells are fan-shaped, thick, grayish brown or brownish yellow in color, with obvious edges on the surface.

2. Meat quality: Rushan oyster is tender and contains high protein and amino acids; Oyster meat is tough and slightly hard, and it is rich in minerals such as calcium and zinc.