This transparent thread-like object is not a parasite, but an organ in the digestive system of the razor clam. It is called a "crystal rod" and is edible. One end of the crystal rod of the razor clam is connected to the sac in the stomach. The other end is outside the body and has two main functions. When the razor clam eats, the crystal rod acts as a mixer to drive gastrointestinal motility and promote food digestion; when the razor clam is hungry, the crystal rod will automatically dissolve and be used to satisfy hunger. Generally, razor clams that have been left for a long time will not have crystal rods in their bodies. However, razor clams will have crystal rods dissolving in sequence due to the speed of their own enzyme decomposition. Therefore, even if fresh razor clams are caught at the same time, some will have crystal rods and some will. No. Crystalline style is also called crystal column and crystal needle. It is a translucent gelatin-like rod-shaped body in the digestive tract of molluscs. Contains a large amount of digestive enzymes and is the main donor of digestive enzymes. Although it is widely distributed in many species of Lavalbranchia and Gastropoda, it is the most prominent in feeding on plankton shellfish. It is collected in the crystal rod sac, and its front end extends into the stomach and is in contact with the chitin gastric shield on the stomach wall. It is rotated in vivo while colliding with the gastric shield and grinding, and the enzymes contained in it are slowly released into the digestive juice. This is most suitable for digestion by feeding on small amounts of plankton at any time, and it is thought that the oyster rotates about 70-80 times per minute. Some crystal rods are easily soluble and disappear when the shells are taken out of the water (oysters); some are solid and difficult to dissolve (clams, oysters). Among the enzymes contained, amylase has the strongest activity, and there are also weak cellulases, oxidases and esterases. No other glycolytic enzymes, lipases and proteases.