There is no difference between raw oysters and oysters. An oyster is an oyster. Oysters generally refer to oysters, also known as oysters, which are the largest farmed shellfish in the world. It is rich in nutrients and has the highest zinc content of any human food. Oyster is not only a delicious food, but its meat and shell can be used as medicine. Oyster shells are rich in calcium. Raw oysters are not recommended as they may contain parasites and other microorganisms. Oyster Habits Oysters generally live in intertidal or subtidal zones in water less than 10 meters deep, and their shells are usually attached to other objects for stationary living. Oysters have a relatively strong characteristic called stress resistance. This is due to numerous changes in the Earth's environment over 200 million years, making them increasingly resistant to temperature, salinity and some diseases. They can tolerate hot and dry weather, cold and freezing weather, and can even live without water for a month.