Mussels are marine organisms in the family Mytilidae of the phylum Mollusca. The shell is wedge-shaped, with a black brown surface, smooth and glossy; The growth pattern is fine and dense, and the inner surface of the shell is gray blue in color. The shell edge has a narrow edge where the outer skin is rolled in, and there are obvious scars on the adductor muscle and outer shell. The hinge has 2-5 granular small teeth; The ligament is slender and located at the dorsal edge of the shell, and is brown in color. Thin jacket, thick jacket edge. Mussels are widely distributed along the coast of China. Growing on coastal rocks, it mostly inhabits areas with rapid seawater currents and clear water quality, and has strong resistance to adverse environments such as red tide and sewage. Food is mainly composed of organic debris and diatoms.