Choose oysters with slightly open mouths in the oyster tray and pat their shells gently. Live oysters will soon close their shells, while indifferent oysters have obviously been "dead" for a long time.
In addition, if it is a fresh oyster cooked by heating, the closed shell will open with heating. Those oysters with closed shells from beginning to end are dead oysters, so don't eat them.
Interpretation: Oyster, also known as oyster, has the highest zinc content in all foods (per 100g oyster, excluding the weight of shell, contains 87. 1% water and 7 1.2mg zinc, and is rich in protein zinc, so it is a good food for zinc supplementation. You can often eat oysters or protein zinc to supplement zinc. It belongs to the family Oyster, namely oyster and related animals, and is a kind of marine shell. Suitable for oyster culture in subtropical and tropical coastal areas, widely distributed in China. Oysters can be produced from the Yalu River in the north to the coast of Hainan Island in the south. Oysters are soft-shelled parasitic animals, especially those produced in the freshwater border of Yu Xian. The traditional artificial oyster culture area in China is called oyster pond or oyster pond. Stone oysters are born with stones, and bamboo oysters are inserted in the bamboo seaside to become floating fields, also known as oyster ponds. Remarks: Oyster, a mollusk, has two shells, one is small and flat, the other is big and bulging, and the shell surface is uneven. Meat can be eaten and oyster sauce can be made. Meat, shell and oil can be used as medicine, also called oysters or oysters.
Living environment: The hard seabed area where oysters live is called oyster bed, which is located in deep or shallow seawater or salty estuary waters. Oysters live in the middle of intertidal zone.
Preservation: Oysters have the longest preservation time among shellfish. At the temperature of 5°C ~ 8°C, oysters can be stored for 7 ~ 10 days in a dry container covered with wet cloth. When storing, we should pay attention to ensure that the oysters face up and are arranged neatly, and can't be put upside down, otherwise the water in the oyster shell will flow away, which will not only lose the charming taste of seawater, but also become dry and tasteless.