1. Appearance of clam: 2 pieces of shell, thick and slightly square. The shell length is 36~48 mm and the height is 34~46 mm.

2. Clam appearance: The river clam shell is about 40 mm long and 30 mm high. The shell is thick and hard, and the shape is slightly equilateral triangle, with both sides slightly symmetrical.

3. Clams and clams are not the same kind of seafood. Clams are the meat of four-cornered clams or various other clams of the Clamidae family. Clam is the meat of clam from clam family. Clams are the upper-class shellfish, while clams are the lower-class shellfish.

The Chinese name for clam is variegated clam. Near Qingdao, it is mainly produced in Jiaozhou Bay. It inhabits the muddy beach seabed below the middle and lower areas of the intertidal zone, and is most produced below the dry tide line. The depth of its habitat in the sand is generally no more than twice its body length. On the first and fifteenth day of each lunar month, after low tide, people often go to the beach to dig for this seafood to satisfy their cravings. For mass production, clam dredging boats are used to collect clams in deep water.

Clams are not only delicious, but also nutritious, making them a high-quality and low-priced seafood. Its meat is extremely delicious and is known as "the most delicious in the world" and "the best of all flavors". There is also a saying among Jiangsu people that "if you eat clam meat, all flavors will fail". It contains protein, fat, carbohydrates, iron, calcium, phosphorus, iodine, vitamins, amino acids, taurine and other ingredients. It is a low-calorie, high-protein food that can prevent and treat chronic diseases in middle-aged and elderly people.

Clams taste salty and cold, and have the functions of nourishing yin and moisturizing, diuresis and swelling, and softening and dispersing knots. "Compendium of Materia Medica" records: "Clams are moist in nature and help body fluids, so they can moisten the five internal organs, relieve thirst, and appetizer. Salty can enter the blood and soften hardness, so blood clots and old habits in housewives are also caused by cold and heat."

Clams contain protein, multiple vitamins, calcium, phosphorus, iron, selenium and other nutrients needed by the human body. The trace amounts of cobalt contained in clam meat are helpful in maintaining the body’s hematopoietic function and restoring liver energy. Better results.

Clams are rich in protein, which is the most important nutrient for maintaining immune function and is the main component of white blood cells and antibodies. Clam can produce sperm and aid fertility, strengthen Jingqi, improve semen quality and enhance sperm motility. It is suitable for treating impotence, low back pain, frequent urination and insufficient Qi to replenish the five internal organs caused by kidney yang deficiency.