Clams are mollusks with oval shells and light brown and purple edges. They live on the bottom of shallow sea, and there are many species, such as clams, clams and Xishi Tongue. Its meat is very delicious, known as "the freshest in the world" and "the highest in all tastes", and its nutrition is also very comprehensive. It contains protein, fat, carbohydrate, iron, calcium, phosphorus, iodine, vitamins, amino acids and taurine, with low heat energy, high protein and low fat. It can prevent and treat chronic diseases of middle-aged and elderly people, so it is a cheap seafood.

Meretrix meretrix is a unique seafood in Qingdao, Dalian, Yantai, Weihai and other coastal cities. It is called clam in Dalian, commonly known as gá la in Qingdao (soft here) and gǐ in Yantai. Ruditapes variegata, whose Chinese name is Ruditapes variegata, lives at the bottom of mudflat below the middle and lower part of intertidal zone, and its yield is the highest below the dry tide line. The depth of its perch in sediments is generally not more than twice its body length.

On the first and fifteenth day of the lunar calendar, after the ebb tide, people often go to the seaside to dig this kind of seafood to satisfy their thirst, while in mass production, they use mussel dredgers to fish in deep water.

Clam meat is rich in nutritional value. 100g clam meat contains protein 10g, fat 1.2g, carbohydrate 2.5g, and various minerals and vitamins such as iodine, calcium, phosphorus and iron, while clam shell contains calcium carbonate, calcium phosphate, magnesium silicate, iodine and bromide. Modern medical research has found that there is a substance called clam element in Meretrix meretrix, which has anti-cancer effect of inhibiting tumor growth.

Reference source Baidu Encyclopedia Meretrix