Crayfish is a rare delicacy in China. Every summer, the sales of crayfish can be said to be very large, but it is forbidden to sell crayfish in Japan, which is also a very confusing place for everyone. In the eyes of the Japanese, crayfish is regarded as an exotic creature, so it will destroy the ecological balance. In order to prevent this phenomenon, Japan banned the sale of crayfish, because it would affect the ecosystem, and crayfish's reproductive ability was very fast. Once many people start eating crayfish, Japan cannot control the growth rate of crayfish.

Crayfish originated in the southeastern United States and was first found in this place. Later, crayfish gradually spread to Japan, and from Japan to China. Crayfish itself is very clean, but with the destruction of water sources, crayfish gradually like to be in some mud. Crayfish in China are mainly distributed in various provinces and cities in the middle and lower reaches of the Yangtze River. Generally, crayfish living in clean water will grow bigger, while crayfish living in mud will grow bigger.

In the early years, crayfish were regarded as bugs, and no one dared to eat crayfish. Crayfish is an omnivorous plant, which can eat some small fish, shrimp and carrion, so many people think crayfish is very unclean. Generally, after buying lobsters, they can be stored in fresh water for 1 to 2 days, so that lobsters will be cleaner.

Crayfish is really a very good food, but we also need to pay attention. We shouldn't eat too much, otherwise it will have a certain impact on our health. Crayfish before World War II can't be eaten, but now it can be eaten. Crayfish was introduced into China from Japan after World War II. Crayfish first began to breed in Jiangsu Province. Because crayfish breed very fast, crayfish business has also appeared in some provinces and cities in the middle and lower reaches of the Yangtze River.