A brief introduction to Rushan oysters
The Rushan oyster is commonly known as the sea oyster, belonging to the phylum Mollusca, class Bivalvia, and pearl oyster. They are one of the important marine biological resources available to humans. Rushan oysters are not only delicious, but also nutritious and have high nutritional value.
In human food, the zinc content in Rushan oysters is very high. Both ancient and modern Chinese and foreign people believe that Rushan oysters have great benefits for people's physical health. As a high-quality marine shellfish, Rushan oysters not only have delicious edible value, but also taste very delicious, so they have been warmly welcomed by everyone.
The cross-section of the oyster shell in Rushan can be divided into three layers. The outer layer is a thin and transparent stratum corneum, the thicker middle layer is a columnar structure composed of calcium carbonate, called a prismatic layer, and the inner layer is a piece of calcium carbonate. This structure is called mother of pearl. The crust is formed by secretions from the lower mantle. The lid extends from the top of the oyster shell to the ventral edge. It is a membrane sandwiched between two layers of epithelial cells. There are muscle fibers in the membrane that can adhere to the inner surface of the shell. The edge of the membrane thickens to form a triple fold, and the inner fold has radiating and circular muscles to bring the edge closer to the outer shell. There are a large number of sensory cells or organs in the center of the oyster, which have functions such as touch and vision. Wrinkles have a strong secretion function.
The two shells of the Rushan oyster are not equal, with the left or lower shell being larger and concave, and the left shell fixed to rocks or seabed piles. Usually, in the later stage of the larval stage of oysters in Rushan, mucus is secreted by the foot filaments, while the edges of the mantle are fixed on the matrix, and then the shell secreted by the mantle attaches directly to the shell. The feet completely disappear, the anterior adductor muscle also degenerates and disappears, and the posterior adductor muscle moves to the middle of the body, thus completely losing the ability to move.