Oysters have two shells, but they are very different from the two shells of mussels. The two shells of mussel shells are symmetrical. Oysters are fixed on the rocks or other foreign objects with the left shell. Therefore, the size and shape of the two shells are different: the left shell is slightly larger and slightly concave, while the right shell is slightly smaller. Slightly flat. The shape of oyster shells differs depending on the species, or although they are of the same kind, there are often great differences due to the different shapes of the fixed rocks.

The composition of oyster shells is mainly calcium carbonate, which accounts for about 94-99% of the total shell composition. There are other ingredients such as magnesium and iron. Its structure is similar to that of apes, consisting of a stratum corneum, a prismatic layer, and a nacre layer. In general, its nacre layer is thinner than that of oysters and pearl shells, but it is far inferior to their luster.

Oysters have ligaments and adductor muscles, so their two shells can be freely opened and closed like a gill, but its ligaments are born in a fixed ligament trough on the back of the shell. Only one of its adductors, located in the middle of the body and slightly behind, is called a single column. The adductor muscle is well developed and corresponds to the posterior adductor muscle of the scorpion.

The oyster's mantle is open in the abdomen without access to water holes or water pipes. When the oysters open the shell, the water flows from the mantle of its mantle into the outer cavity of the coat, then passes through the gills and flows out of the back, where the oysters breathe and ingest food.

Oysters live on solid ground. Once fixed on rocks, wood, iron, bamboo, tiles and other objects in the sea, they can never fall off. Therefore, its adult body has no other activity than the opening and closing of shells. It uses food, like mussels, to get nutrition such as diatoms and organic crumbs by relying on the flow of water into its body.

There are two types of oysters: hermaphrodite and dioecious. Therefore, there are two types of oyster breeding methods. The hermaphrodites are of the juvenile type. In their gonads, sperm and eggs can be produced at the same time, and their eggs can be fertilized and hatched in the coat of the mother's body. When they become larvae, they leave the mother's body. The breeding method of the dense scale oysters is A variety of types. The dioecious species are oviparous. They cannot produce both sperm and eggs in their gonads. Sperm and egg are hatched in seawater. The breeding methods of Oe Oyster and Pleurotus ostreatus belong to this type.

Oysters have a large number of spawns and are more of an oviparous type. An immature female can produce hundreds of thousands of eggs in 15 minutes. An oviparous female can produce tens of millions of grains at the same time. This breeding method ensures the prosperity of future generations.

The spawning season of oysters varies slightly depending on the species and area. Generally in the summer, from about June to September, the south is slightly earlier than the north. At one time, the oysters produced a large number of eggs and sperm. After fertilization, the fertilized eggs gradually developed and eventually metamorphosed into adults after the larvae and platter larvae. Later in the larvae of the faceplate, the faceplate degenerates and the foot is born. At this time, if it encounters an appropriate situation, it begins to attach, becomes a metamorphosis, and has a life of fixation. Interestingly, the sexual transformation of the dioecious type of oyster is that under certain environmental conditions, it can transform male and female. If the first year is male, sperm is produced, but by the second year it can be transformed into female. Produce eggs.

Each winter and spring is the oyster harvest season. China's folks have the popular chant of "the winter solstice to the Ching Ming and the glutinous meat." This means that the oyster meat from the winter solstice to the next Qingming Festival is the most fertile and is the best time to eat. At present, many areas along the coast adopt a three-dimensional culture method, and there are basically oyster meat supplies throughout the year, which is very popular among people.

Oyster meat is smooth, delicious and nutritious, and it is known as "sea milk". According to analysis, dried oyster meat contains up to 45%-57% protein and 7% fat. 11%, liver sugar 19% to 38%. In addition, it also contains a variety of vitamins and taurine and calcium, phosphorus, iron, zinc and other nutrients. Calcium content is nearly 1 times that of milk, and iron content is 21 times that of milk. It is a precious food for skin beauty and disease prevention.

"Compendium of Materia Medica" records: oyster meat "more food, can clean skin, kidney yang, and can cure deficiency, solution erysipelas." Modern medicine also believes that oyster meat also has lower blood pressure and nourishing yin and other functions.

Oyster meat is known as delicious Haizheng and bodybuilding food because of its delicious taste and nutrition, its ability to “fine skin and beauty”, its ability to reduce blood pressure, nourishing yin, nourishing blood, and strengthening the body. In many marine treasures, many people only love oysters. The West calls it "God-given magic food" and the Japanese recognize it as "the source of the root" and the praise verses of "Unique oysters in the sky." Many ancient and modern Chinese and foreign celebrities, Yatuo, have had a close relationship with oysters.

According to historical records, the Italian Emperor Victoria's meal is not separated from oysters; Napoleon I ate oysters in the battle to maintain a strong fighting force; the former American President Eisenhower had a oyster after eating every day to speed up recovery; Chinese celebrity Song Meiling also regularly eats oysters. To maintain the beauty of its appearance.

There are many ways to eat oysters. Fresh oyster meat usually has steamed, freshly fried, freshly cooked, scrambled eggs, fried pancakes, skewered meat, and soup. With proper seasoning and steaming, it can maintain its original flavor; if it is soft-fried, it can be marinated by adding a little yellow wine and marinating, and then paste the boiled pork meat on the top and fry until golden brown with soy sauce and vinegar. Food; eat hot pot, bamboo skewers can be used to string oysters, put into the boiling soup for about a minute to remove it can be eaten; if served with meat ginger ginger soup, boiled soup like white milk, delicious. Oyster meat can also be processed into dried products. The product is called scallops. If cooked with fresh oyster meat and sap, dried, or dried, it will become cooked. If you want to keep the full taste, you will not cook. Direct the oyster meat. When it is dried, it will become a famous sun-dried food, and it will be eaten in various ways.

Among the fine varieties of oysters, Guangdong alone has the famous Raoping “Oyster Oyster”, Haifeng’s “Gaoluo Oyster”, Zhuhai’s “Yinkeng Oyster”, among which the manhole oyster in Shenzhen City is the first choice. The body is large and meaty, and the belly is very thin. It is said to be "Shajing, glass belly." Its meat is delicious, and it is crisp and lubricated.

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