Crayfish belongs to the seafood category, and it is not clean whether it is farmed or wild. The viscera, stomach and gills of crayfish are mainly concentrated in the head, and there will be a lot of parasites and stains. In addition, the head of crayfish will also have pancreas, heart, liver and shrimp yellow, especially shrimp yellow and liver are very close, so it is not easy to be distinguished, so be sure to pay attention when eating.
When eating crayfish, it should be thoroughly rinsed in water, and then soaked in low-concentration wine or salt water for two hours, so as to remove parasites from the shell. When eating the head of crayfish, you should clean up the gills and stomach pouch, which can reduce parasites. After sufficient heating, you can eat it with confidence.
When the crayfish is alive, you should hold the crayfish from behind, twist the head shell of the crayfish, and slowly break it down, so that the head shell can be removed, and then brush the head with a clean toothbrush to remove the stains and organs inside the crayfish head. For people with good health and a small amount of crayfish heads, there will be no obvious symptoms. Crayfish has gills on its head, which directly exchanges with external water, and may be contaminated with some bacteria and viruses, causing abdominal discomfort such as diarrhea and abdominal pain after eating.
Crayfish may have parasitic eggs or parasites on its head. If it is not handled properly, it will be infected by parasites and compete with the body for nutrition, which will bring mechanical harm to the body and cause poisoning, allergy and anemia. There is also a liver in the head of crayfish, which has the effect of detoxification, and there will be a lot of heavy metal ions in it, which will easily affect the health of the body.
The common parasite on crayfish is paragonimiasis, which can cause cough and bloodshot sputum after infection. Patients with severe infection have purulent sputum and chest pain. If infected with other organs, it will lead to vision loss, headache, dizziness, epilepsy and dysuria, so when eating crayfish, it must be thoroughly cooked to prevent infection by paragonimiasis.