Clams and clams look alike, but the price and taste are different. The shell of the clam is ovoid, its shell is hard and large, and it has a protruding tip that curves forward.

Clams are widely distributed in the waters of southern China, Japan and South Korea also have a lot of it grows quickly, the culture used for a shorter period of time, adaptability is very strong, can leave the water for a long time to live is suitable for artificial cultivation of a good shellfish. It is one of the four famous cultured shellfish in China, and it has a pattern on the outside. This characteristic is also very good to distinguish.

The corbicula is a small shellfish living in freshwater areas, its shell is also very hard, but the shape is nearly triangular, its shell surface is smooth, without much pattern, the inside of the shell has white or greenish purple pattern. The two can be distinguished by their different patterns and different shapes.