Why do many people say crayfish can't be eaten? Is it really dirty?

It is often rumored on the Internet that crayfish can't be eaten, because crayfish contain heavy metals and will get sick if they live in dirty sewage. In the face of whether these rumors are true or not, here is your answer.

Crayfish live in a dirty environment and die easily. At present, most crayfish on the market are farmed artificially, and there are few traces of wild crayfish. Most farmed crayfish live in clean and pollution-free environment. So it is not reliable to say that crayfish live in dirty sewage. Some scientists have done experiments to produce a lot of sewage for crayfish in a fixed environment. However, the experimental results show that crayfish are difficult to survive or even reproduce. Coupled with the state's supervision of the breeding environment, it is impossible to see crayfish living in polluted waters.

Humans have a long history of eating crayfish and have become a global culture. The first country to eat crayfish was the United States, which has been eating crayfish for hundreds of years. In recent years, crayfish have gradually gone to the world. China exported several tons of crayfish to Russia when Russia held the sports meeting in 20 18. These crayfish are cooked into delicious food, and people watch wonderful football matches while drinking beer and eating crayfish. There are many cooking methods for crayfish in China, including garlic crayfish and spicy crayfish, which shows that crayfish are deeply loved by people.

The head of crayfish does not contain heavy metals, nor is it used to clean sewage and purify the environment. Crayfish heads contain heavy metals, which is only an individual case, because those crayfish live near factories and crayfish contain heavy metals. At this stage, crayfish are farmed artificially, far away from the factory, and there will be no phenomenon of excessive heavy metals. People don't use crayfish to purify water, because the ability of crayfish to purify water is limited, and because the market is in short supply. It is difficult for crayfish to grow and breed on a large scale in sewage environment. Only a clean and sufficient water environment can ensure the healthy growth of crayfish.