It should be kept at about 0.7- 1.2 m in spring, because sometimes shallow water is beneficial to the growth of aquatic plants and the development of plankton in water bodies! Under the pond, according to the actual situation,1~ 3 mu should be built in a ring shape or a dish shape, and the pond should have a slope, but not too steep, leaving an island in the middle. When designing the crayfish culture pond, we should make relevant plans. There is an appropriate shallow water area with a water depth of about 1 m and an appropriate deep water area with a water depth of about 1.5 m.. Shallow water area is mainly used for crayfish foraging and molting.

Lobster grows most vigorously in summer, and the amount of fertilizer fed is large, so fresh water should be connected to the pond at a fixed time, which is also one of the most commonly used and economical methods to regulate water quality. Generally, fresh water is added every seven to ten days. Crayfish has a strong viability. If conditions do not allow, there is no need to deliberately deepen the water depth of the breeding ground! However, it is better to have a deep water surface in the whole breeding ground, and the pond and water source should not exceed 50 meters, so as to reduce the water adding time. Some farmers don't pay attention to it. It is necessary to pull 200 meters of 6-inch water pipes into the water. The electricity bill is tens of thousands a year, and the cost is invisibly increased. It is best to bury the pipeline and directly feed water.

During the early growth of aquatic plants, the water level was controlled at about 20 cm, and it deepened to 30-40 cm in late June, then to 60-80 cm in mid-July, and then to 100- 120 cm in early August. It can be said that dissolved oxygen in water is mainly produced by algae and aquatic plants. However, they need to make oxygen through photosynthesis, so if the water level is too deep, they will face the problem of insufficient illumination.

Crayfish culture must have proper deep water and proper shallow water, all of which are deep water culture, and it is difficult for crayfish to have high yield, and all of which are shallow water culture, and it is also difficult for crayfish to have high yield. In the choice of farm land, it must be determined according to the situation in your own area. If only paddy fields can be cultivated, choose paddy fields, and if possible, choose ponds, lakes and so on.