2. Japan is a springboard for crayfish to enter East Asia. By the 1960s, crayfish had appeared in Japan, including Hokkaido. Except for some islands, even the Japanese relative of Procambarus clarkii, Japanese black crayfish, was almost killed by it.
3. In the early1990s, crayfish quickly boarded the tables of food stalls in Hubei, Anhui and Jiangsu. The vendors selling crayfish are looking forward to the international market after counting the money and having cramps in their hands.
4. In order to adapt to the harsh living environment, crayfish has undergone a peculiar evolution in China, and new varieties such as spicy crayfish, fennel crayfish and steamed crayfish have appeared.
Extended data:
Crayfish (scientific name: Procambarus clarkii): also known as Procambarus clarkii, red crayfish and freshwater crayfish. Shaped like a shrimp with a hard shell The adult is about 5.6~ 1 1.9 cm long, dark red, with nearly black carapace and wedge-shaped stripes on the ventral back.
Young shrimps are evenly gray, sometimes with black ripples. Long and narrow claws. The middle part of the carapace is not separated by a mesh gap, and there are obvious particles on the carapace. The frontal sword has a lateral thorn or a notch at the end of the frontal sword.
Main value
1, look
Because most crayfish have very strong anti-pollution ability, they can still survive in water containing highly polluting toxins. Stocking in the aquarium can also effectively remove fish excreta and moss, which makes a great contribution to the improvement of hydrological environment.
2. Nutrition
Crayfish has high protein content, soft meat and easy digestion. It is excellent food for people who are weak and need to be nursed back to health after illness.
Shrimp meat is also rich in magnesium, zinc, iodine and selenium. Magnesium plays an important role in regulating heart activity and protecting cardiovascular system. It can reduce the cholesterol content in blood, prevent arteriosclerosis, dilate coronary artery, and help prevent hypertension and myocardial infarction. Crayfish contains astaxanthin, which is a strong antioxidant.
Scientists at Osaka University in Japan have found that astaxanthin helps to eliminate the "jet lag" caused by jet lag. In addition, crayfish can also be used as medicine, which can eliminate phlegm and relieve cough and promote postoperative wound healing. ?
3, recipes
Crayfish is widely welcomed because it is bigger, more fleshy and delicious than other freshwater shrimps, and it is made into various dishes.
References:
Baidu encyclopedia-crayfish