Shrimp line is to clean the internal organs of shrimp. Generally speaking, the digestive system of shrimp such as intestine is easy to accumulate heavy metals. Before cooking, the shrimp line should be pulled out. The shrimp line on the back of shrimp is the waste that shrimp has not excreted.

In fact, the shrimp line is the intestines of prawns. In the shrimp line, there are semi-digested shrimp and some excrement. Because prawns are omnivores, they usually eat a lot of things, usually plankton, algae, animal and plant residues and so on.