First, I like water bodies with clear water quality, sufficient dissolved oxygen and abundant aquatic plants; Hate fat water and sewage, fear of hypoxia, and avoid bad water quality is very obvious.

Second, like weak light, afraid of strong light, like quiet, afraid of alarm. When the water temperature is above 10℃, it begins to feed. If the water temperature is too high, it can inhibit the feeding, growth and molting of the river crab.

3. The shape of the pond is a rectangle with a length-width ratio of 5: 3. The soil bank is wide and the soil is compact, loam is the best. There is no water leakage in the pond, and the silt at the bottom of the pond is no more than 5 cm.

1. Crab contains more vitamin A, which is helpful for skin keratinization; It can also supplement calcium for rickets in children and osteoporosis in the elderly. China is widely distributed in lakes along the north and south coasts, among which the Yangtze River system has the largest output and extremely delicious taste.

2. The meat is delicious, nutritious and of high economic value. This crab can only eat live crabs. After protein in dead crabs is decomposed, it will produce crab venom.

3. Every100g of Eriocheir sinensis contains protein 14%, fat 5.9% and carbohydrate 7%. In addition, it also contains vitamin A, riboflavin and nicotinic acid, and its calorific value exceeds the nutritional level of ordinary fish.