Then, make sure every bite of meat is clean. People only eat the tail of crayfish, and the head of shrimp should be pulled off. This so-called shrimp head is actually called the head and abdomen, which also contains the internal organs of crayfish, and the dirty things are basically in the head. Shrimp line is only a part of crayfish intestine, not the dirtiest. However, you should know that the internal organs and intestines are connected, so removing the shrimp line is an outlet for the dirty things in the head and abdomen.
Lobster should be fed with clear water for 24 hours before cooking, and shrimp heads and shrimp lines should never be eaten.