There is no difference between oysters and oysters. Oysters are oysters. Oyster generally refers to oyster, also known as oyster, which is the largest cultured shellfish in the world. Rich in nutrition, zinc content ranks first in human food. Oyster is not only a delicious food, but also its meat and shell can be used as medicine. Oyster shells are rich in calcium. Eating oysters raw is not recommended because they may contain parasites and other microorganisms. Habits of Oysters Oysters generally live in intertidal zone or subtidal zone with water depth less than 10 m, and their shells are usually attached to other objects for fixed life. Oysters have a strong characteristic, which is called compression resistance. This is because the earth's environment has changed countless times in 200 million years, making them more and more resistant to temperature, salinity and some diseases. They can endure hot and dry weather, cold and freezing weather, and even live without water for a month.