The razor clam, whose scientific name is the razor clam, is a mollusk and a bivalve clam. It lives in the ocean and is a common seafood ingredient.

The shell is brittle and thin, and is oblong and square in shape. From the top of the shell to the ventral edge, there is a diagonal groove, hence its name.

There are many tidal flats along the coast of Ningbo, which has unique advantages for cultivating razor clams. It is a specialty of Ningbo Dazhong Sea. The Ninghai Long Street area faces Sanmen Bay. A large amount of fresh water is injected into it all year round. The sea water is suitable for saltiness, the bait is rich, and the coating is made of sand.

Mainly, razor clams grow quickly, are large in size, have tender and fat meat, white color and delicious taste, so they are named Changjie razor clams. According to the records of "Ninghai County Chronicles" of the Qing Dynasty: razor clams and mussels belong to the genus.

Narrow and as long as the middle finger, it is called Xi Shi's tongue, which is said to be beautiful.