What are the management methods of crayfish culture in the rainy season? Do a good job at 3 o'clock to make a safe transition!

In July, crayfish farming areas also entered the hot and redundant Meiyu season, which can be a hurdle in aquaculture, and a little carelessness in aquaculture management may lead to a reduction in production, or even lose money. What are the management methods of crayfish culture in the rainy season?

Management method of crayfish culture in plum rainy season

1. Management of aquatic plants

The plum rainy season is the key period for the management and control of aquatic plants, because it is the most vigorous time for the growth of aquatic plants. If there is no abnormal control in the early stage of the rainy season, the ecology of the whole culture environment will be affected in the later stage.

First of all, for the overgrowing Elochia, we should properly pull the grass to dredge the row spacing, and at the same time regularly use oxidized base reform, grass fertilizer to promote rooting, increase dissolved oxygen at the bottom, reduce yellow root and black root, promote white root, and prevent high temperature rotting roots and bleaching grass in July. For the Elorella vulgaris in the deep trench and the Elorella vulgaris which are seriously attached to the setae, it should be fished out in time.

Secondly, verticillium verticillata is likely to have problems in the rainy season, in addition to the spread of insect pests, the problems of yellow root and black root are prominent, the water plants in Tangkou are easy to float, and at the same time, they are accompanied by dirty water plants, slow growth and so on. Once the above problems occur, we should use the plum rain season to drop the water level in time, increase oxygen to change the bottom, and use grass-saving products to save grass in time, so that a good pond of aquatic plants can safely survive the high temperature period.

Finally, if the net is ready to be released after the Meiyu, before the purse seine of Sakata is removed, snails or young snails can be properly put in, which is helpful to the grass protection of Sakata plantain and verticillium verticillata.

2. Do a good job of crayfish escape prevention

The most direct impact of the rainy season is that the water level of the culture pond rises, which eventually leads to the crayfish escape caused by the ridge of the pond water, and even leads to the dike collapse of the culture pond, resulting in irreparable losses.

Therefore, before the rainy season comes, we need to do a good job in the inspection and repair of the escape prevention net, the drop of the water level of the culture pond, the cleaning of the inlet and drainage roads and the reinforcement of the ridge of the culture pond, and we need to strengthen the pond patrol in the rainy season to discharge the excess water from the culture pond in time. Take precautions against it and make more inspections.

3. Increase oxygen in time

After a long period of rain, the environment has been in a state of low pressure, which can easily lead to the decrease of dissolved oxygen content in culture ponds. The crayfish exposed to hypoxia for a long time will cause irreversible damage to the crayfish, resulting in slow growth and serious death. Therefore, it is necessary to closely monitor the dissolved oxygen in the water for a long time in the rainy season, and turn on the oxygen-increasing equipment or sprinkle the oxygen-increasing agent in time when the dissolved oxygen is low.

4. Adjust the water quality

Rain Water has increased since May, especially the Meiyu season will make the muddy phenomenon caused by hypoxia more serious, so it is necessary to first solve the problem of hypoxia, and then purify the water, and then pay attention to stabilizing the water. At the same time, fertile water culture beneficial algae, especially the bottom algae, increase the dissolved oxygen in the pond and improve the self-purification capacity of the water body.

Secondly, increase the intensity of bottom change and water transfer, and regularly use oxidation bottom reform to improve the bottom environment and degrade the bottom organic matter. Use low-oxygen-consuming Bacillus or photosynthetic bacteria to regulate water color in 7-10 days to prevent water concentration and cyanobacteria.

In addition, for the bad water color caused by naked algae and cryptic algae in the ponds fed chilled fish, attention should be paid to changing the bottom, using bacteria for water purification, and replenishing benthic algae to balance algae and improve the transparency of the water body.

Meiyu season is the key period of crayfish farming in a year, only a smooth transition can ensure the yield, farmers should not be taken lightly.