Clams, mollusks, shell ovoid, light brown, purple edge, living in the shallow seabed, there are clams, clams, Xishi tongue and many other varieties. Its meat is delicious, known as "the world's first fresh", "the crown of all flavors", and its nutrition is also more comprehensive, it contains protein, fat, carbohydrates, iron, calcium, phosphorus, iodine, vitamins, amino acids and taurine and a variety of other ingredients, low-calorie, high-protein, less fat, and can be used as an ingredient of the clam. It contains protein, fat, carbohydrates, iron, calcium, phosphorus, iodine, vitamins, amino acids and taurine and many other ingredients, low calorie energy, high protein, less fat, can prevent and cure chronic diseases of middle-aged and old people, it is a cheap seafood. Currently found the oldest clam for 507 years old (unfortunately in the study, the researchers killed it). In addition, the clam is also known as one of the earth's five immortal beasts.