Seafood has parasites. Lobster head not only contains parasites, but also poisons inhaled by river pollution. Lobsters have parasites in them. Most crayfish are parasitic with paragonimiasis, and paragonimiasis is mainly parasitic in human lungs. Ranging from coughing, chest pain and hemoptysis to massive bleeding in the lungs, causing organ blockage and death. Three Beijingers once suffered from "acute osteolysis" due to crayfish poisoning, which was almost life-threatening. Parasites on crayfish are difficult to remove. In addition to cleaning the crayfish before eating, the tendons on the back of the crayfish should be removed. Cooking must be thoroughly cooked, and it is best not to eat the head of crayfish when eating. At the same time, pay attention to the following points: First, dead lobsters must not be eaten. Because lobster is a high-protein organism, it contains many bacteria. When the lobster dies, the bacteria decompose immediately, and people are easy to be poisoned and have diarrhea after eating it. Second, after buying live lobsters, it is best to put them in clear water for 24-36 hours to let them spit out impurities such as sediment and kill bacteria. Third, when processing lobsters, we must remove the dirty things in the gills, because many bacteria are adsorbed in the gills, so it is best to brush the shrimp shells clean with a brush. The roots of lobster claws are the easiest to hide evil and shelter evil, so they must be cut off. Finally, you have to scrub before cooking. Fourth, cooking crayfish must be thoroughly cooked at high temperature, so as to ensure the killing of bacteria and parasites in lobsters.