Black is good. The shell is slightly black, and pure yellow is not good.

The reasons are as follows:

The beach in Donggang is a silt beach, and the water is a mixture of sea water and fresh water (in local dialect, it is a mixture of sea water and fresh water. The salinity is not high) and the organic matter is rich, causing the shell to turn black. The meat is of good quality, but the price is high, at least seven or eight yuan per catty.

The pure yellow ones are yellow clams transplanted from Shandong and Zhejiang. They are very thin and have particularly poor meat quality. They are cheap, costing 10 yuan for four to five kilograms