The online explanation of Oyster is: Oyster Oyster: mollusk Oyster: BiBi Zhou's song Oyster: Traditional Chinese Medicine. The nature of Ode to Reed is: noun. The phonetic notation is: ?ㄨˇㄖ _. Structure: Oyster (left and right structure). There are rough and irregular shells, small or no feet, no water pipes, living on the seabed or in shallow coastal waters, or on rocks or other objects in salty and fresh water in estuaries, and feeding on small plants and animals brought by water currents.
Oysters (Ostreaceae), commonly known as oyster seeds and oysters, belong to mollusks. Bivalves, oysters and oysters are collectively called oysters. Oyster is the largest cultured wild shellfish in the world, one of the important marine biological resources available to human beings, and a globally distributed species.
There are many kinds of oysters, of which about 20 are of commercial value. Oysters for human consumption usually come from the genus Oyster and the genus Crassostrea. They are not only delicious and nutritious, but also have unique health care function and medicinal value, and are a kind of seafood treasure with high nutritional value.
morphological character
The shell can be divided into three layers in section; The outermost layer is a thin and transparent stratum corneum, the thickest layer is a columnar structure composed of calcium carbonate called prismatic layer, and the inner layer is a flaky structure called nacre. The shell is secreted by the lower mantle, which extends from the top of the shell to the abdominal edge. It is a two-layer epithelial cell.
There is a membrane made of connectivetissue in the middle, and there are muscle fibers in the membrane to make it adhere to the inner surface of the shell. The outer membrane is thickened to form three folds, and there are radial muscles and annular muscles on the inner folds to make the edge close to the outer shell. There are a large number of sensory cells or organs in the folds, which have tactile and visual functions. The outer fold has a strong secretory function.