Recommended collection of shrimp pond management methods in hot and rainy seasons!

In the process of shrimp culture, the weather changes, especially after continuous rain, shrimp is prone to problems. Now is the time when rainy weather is most concentrated. It is very important to analyze the harm of rainy weather to shrimp culture, and do a good job of prevention before rain and timely treatment after rain to improve the success rate of shrimp culture.

First, the causes of rainy days.

1, water temperature change

Generally, the temperature of rainwater is lower than that of shrimp pond water, and the temperature difference between them is greater in summer. The specific gravity of rainwater is low. When it rains, it will be mixed with pond water, which will reduce the temperature of surface pond water and weaken photosynthesis and biochemistry.

2, lack of water and oxygen

First, the erosion of rain makes organic matter such as feces and residual bait float on the bottom of the pool, which increases the chemical oxygen consumption of water; Moreover, in rainy weather, the weather is sultry and low-pressure, which leads to the reduction of oxygen dissolved in surface water in the air; Thirdly, the photosynthesis of phytoplankton is also weak, resulting in insufficient dissolved oxygen in water; Finally, rainfall causes the stratification of salty and fresh water, which hinders the oxygen exchange between the bottom water and the upper water, and the bottom water body lacks oxygen.

3. The water turned pale

In rainy days, a large number of algae died (inverted algae), which led to the clarification of pool water and the breeding of benthic moss. Moss has strong photosynthesis and strong absorption of nutrients in water, which limits the growth of phytoplankton. Moreover, the pool water is crystal clear, which is not conducive to the habitat of shrimp. A large number of algae die, which not only directly pollutes the shrimp pond, but also makes the shrimp pond grow moss, making the shrimp extremely dangerous.

4, water quality deterioration

Due to the erosion of rainwater, the organic matter at the bottom of the pond rises, and the water body lacks oxygen. Due to the decrease of water temperature, the biochemical effect weakens, which leads to the increase of chemical oxygen consumption (COD), the increase of harmful substances such as ammonia nitrogen and nitrite, and the injection of rainwater, which leads to the decrease of pH value and the deterioration of water quality in a short time.

5. Stress response

The sudden change of environmental factors such as water temperature and pH caused by rainfall is easy to cause stress reaction of shrimp and lead to shrimp death. In addition, the decrease of salinity caused by precipitation and the changes of other environmental factors are also easy to cause abnormal molting of prawns.

Second, the preventive measures before it rains

Doing a good job of prevention before rain can reduce the harm of rainy weather to prawns to a certain extent, which requires farmers to pay close attention to the weather forecast, grasp the weather changes in advance and do a good job of prevention in time.

1. Pay attention to maintaining the stability of algae phase at ordinary times, regularly use diatoms, amino plant fertilizers, special fertilizers and water emulsion, appropriately increase the algae density in aquaculture water, and maintain a certain degree of fertilizer efficiency. This can buffer the drastic changes of pond water quality caused by long-term rainy weather.

2. Keep a certain water level before it rains. The smaller the amount of water in the pool, the greater the impact of rainwater on the pool water. Minimize the exchange between rainwater and pool water, and lift the upper gate before it rains, so that the top of the gate is flush with the pool water surface, so that the rainwater can be discharged in time. Clean up the flood drainage ditch in time to prevent rainwater from entering the pool.

3. Mix bile acid and Eucommia ulmoides leaf extract in the feed to enhance the physique of prawns and enhance their anti-stress ability.

4. Adjust the water quality before the rainy weather comes; The application of oxygen enrichment and detoxification can reduce the deterioration of bottom materials in fish and shrimp ponds and improve the dissolved oxygen in ponds by chemical methods.

Three, in the rain, after the rain treatment measures

Deal with it in time after the rain, otherwise prawns will easily die in large numbers. In the treatment after rain, detoxification and water transfer are particularly important.

1, strengthen daily management.

Pay more attention to patrol the pond and observe, record and analyze the abnormal situation in time, carefully observe the water quality change and individual shrimp deaths, find out the reasons and deal with them in time. Grasp the changes of ammonia nitrogen, nitrite, pH, algae phase and shrimp diseases in pond water in time, find problems in time and take measures as soon as possible.

2, start the aerator

If possible, the aerator should be started all day, which can also stir the water body and eliminate the stratification of the water body. If there is no aerator, liquid oxygen should be applied once every 12 hours, and when floating head appears, its application amount can be increased to 2 ~ 3 times of the normal dosage; And manual paddling is needed to stir the water body and eliminate stratification.

3. When "algal bloom" occurs, it should be handled in time.

First, turn on the aerator, then use the aerator to detoxify the bottom, and then use Bacillus and algae-growing products to fertilize the water.