Water quality Management Technology of Crayfish Culture Pond

Freshwater crayfish have strong adaptability to the environment and tolerance to hypoxia, and can even directly use oxygen in the air, but being in the environment of hypoxia, excessive fertilizer or deterioration of water quality for a long time will affect the molting rate of freshwater crayfish, thus affecting the growth. Therefore, water quality is an important factor that restricts the growth of freshwater crayfish and affects the yield of shrimp culture. Poor water quality can also promote the proliferation of parasites, bacteria and other pests, leading to the occurrence and spread of disease, when the water quality is serious, it will also cause crayfish death. When cultivating freshwater crayfish with high density in the pond, the transparency of the pond water should be controlled at about 40 cm, and the water transparency should be adjusted in time according to seasonal changes and water temperature and water quality, and water should be added, changed and fertilized in time to create a good water environment. Master the following principles in water quality management of freshwater crayfish culture:

Water quality of crayfish culture pond

1. The principle of "shallow spring and full summer"

The water level in spring is generally kept between 0.6 and 1m, and shallow water is beneficial to the growth of aquatic plants, snail breeding and molting growth of young shrimp. When the water temperature is high in summer, the water depth is controlled at 1-1.5 meters, which is beneficial for crayfish to get through the high temperature season.

2. The principle of "fat first, thin later"

Keeping the culture water "fat, alive, tender and cool", the early shrimp seedlings are young, and the fertilizer and water can cultivate plankton, which is beneficial to improve the survival rate of young shrimp; in the middle and later stage, the thin water quality can promote the rapid growth of crayfish and increase the yield. Generally, the transparency of the pool water is about 30 cm in the early stage and more than 40 cm in the later stage.

3. Improve the water quality of aquaculture

Spraying secondary lime water every half a month and using quicklime 10 kg per mu of water depth of 1 meter can increase the concentration of calcium ions in the water and promote the molting growth of freshwater crayfish by keeping the PH value between 7.5 and 8.5. Microbiological agents are applied regularly to improve the water quality and bottom quality of culture ponds.

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