Cold Shed Measures for Winter Shed and Wai Tang Shrimp

In the past few days, the strongest cold wave in the second half of the year affected many regions in China. The first snowfall occurred in many provinces, and the rainy weather in the south increased, bringing great influence on shrimp farming in winter, further exacerbating the temperature difference between day and night in shrimp ponds. Instability, slow growth of prawns, and reduction in food consumption; poor shrimp resistance. In addition to the quality of seedlings, the lack of nutrients and trace elements in daily intake of prawns during aquaculture is one of the key causes of these diseases. .

Once shrimp lacks sufficient mineral elements such as calcium and magnesium, it is prone to a large number of soft shells, jejunum empty stomach, bow body, shrimp turbidity, and stealing. In addition, rainwater can also induce pH instability in shrimp ponds and decrease shrimp resistance. At this time, how to stabilize the water body and enhance the prawn physique becomes an important task in dealing with cold weather.

I. Impact of low temperature weather on shrimp aquaculture

1, the impact on growth

In cold weather, when the water temperature decreases, shrimps have lower enzyme activity and poorer digestion and absorption rates. The food intake of shrimp is reduced, and the return of feed is severe. Even if there are occasional feeds, it will hardly grow. When the temperature is lower than 18°C, the shrimps consume negative energy in the body, affecting the shelling time of the shrimp, and also lead to stress shelling. After the temperature has dropped, as the weather turns fine, the temperature and water temperature rise, and the remains of sediments, excrement, and dead algae can easily breed harmful bacteria. The oxygen consumption rate of water respiration increases, and the bottom of the pond is easily anaerobic and produces various toxins. Kill the shrimp poisoning.

Cold air passes through various shrimps in shrimp ponds before and after

2. Impact on water quality and sediment quality

Low temperature is often accompanied by rainy days. Oxygen in the water is reduced and oxygen consumption is increased. The body's ammonia, nitrite, and other harmful physical and chemical factors increase. Shrimp can develop lesions and prone to hypoxia and poisoning.

When the water temperature is greater than the temperature in the winter shed, convection occurs between the higher temperature flow at the bottom of the pond and the lower temperature flow in the upper layer. The toxic substances at the bottom are liable to “return to the bottom”, aggravating the water change, and the oxygen consumption is extremely serious; a large number of harmful bacteria floating at the bottom float up and spread, and the shrimp are prone to error. Symptoms such as diarrhea, gastro-intestinal disease, or poisoning caused by food and adhesion to the palate, and the limited water exchange in ponds, combined with incomplete drainage at the bottom of the pond, are easily exacerbated by anaerobic fermentation and produce toxins that affect shrimp growth.

Second, the water and stable water measures for winter shrimp farming

The winter shrimp is not well-cultivated, and the weather is uncertain. Therefore, water quality management in this period is mainly based on stable water. In combination with the water exchange operation, it is necessary to supplement the trace elements of shrimp, especially calcium, so that shrimp can have a hard outer shell to withstand freezing weather. And the impact of changes in water quality can brighten the body and prolong the transportation to sell a good price. Calcium is the key substance of the hard shell of shrimp, and it is an important trace element that promotes the fast hard shell of shrimp, enhances life activities, and strengthens anti-stress ability and immunity. Farmers need to regularly check the contents of trace elements such as calcium, magnesium, and potassium in shrimp ponds. For shrimp ponds with unstable bodies of water, Anjin giant calcium can be used for full pond sprinkling, which can increase the daily trace elements of shrimps It is calcium and also stabilizes the pH of the water.

Third, the winter shed shrimp attention problem

1, water control algae

As the winter shed shrimp is used for closed breeding, the water temperature inside and outside the shed is quite different. Generally, it is not suitable to change the water. Changing the water easily causes the shrimps to respond to stress. The water level can be properly improved to keep the water body stable and reduce stress. Under the same conditions, the higher the water level, the greater the water capacity, the more plankton, the more feeding creatures, the more oxygen produced, the better the water quality, and the stronger the anti-stress ability. It is easier to avoid the possibility of morbidity due to water stress.

Pay attention to the cultivation of algae before putting seedlings. Fertilizer is to cultivate good algae and the function of algae: First, increase dissolved oxygen in water (about 70% of oxygen in water is provided by algae); Second, absorb water. Harmful substances, purification of water bodies; Third, shrimp eat natural food.

2, disease prevention

In winter sheds, bacterial diseases are generally not too many. The main epidemic is viral diseases. The main prevention is the red body and white spot, and these viral infectious diseases are currently not yet available for the treatment of the exact drug, so prevention is very important, pay attention to regular disinfection, timely removal of sick shrimp, dead shrimp, to create a good water quality and the bottom Quality environment.

The winter shed is likely to cause diseases such as stress response, stealing, cramping, jumping in the pond, climbing sand and fringe, and red-white spot syndrome due to water quality and weather changes, etc., and appropriate aerators to prevent diseases and increase oxygen levels. The machine time should be every night, especially from 4am to 7am. In addition, in the middle and late period of breeding, it should be started in time for rainy days. At noon, there is sufficient sunlight and strong photosynthesis. Generally, it is not easy to lack. oxygen. The purpose of starting at noon is mainly to stir the water body, so that the upper and lower water bodies produce convection and maintain the water balance.

3, bait management

Pay attention to the control of feeding amount, must not rush to increase the amount of food under good conditions can not be added every day, the same amount can be maintained for 2-3 days before adding, this can avoid overeating shrimp, but also effectively avoid the excessive food The waste caused a high feed coefficient and aggravated the cost of farming. In the breeding process, some high-nutrients can be added in an appropriate amount to enhance the disease immunity and anti-stress ability of shrimps. In the morning and in the evening, they can make more investment, and they will cast fewer shots at noon. A small number of shots will be given 3-4 times a day. When the first and the fifteenth shells are dropped, they will be cast more often after the clam shell. You can choose one every 7-10 days. 2 meals do not need to feed; gale or low air pressure, less hot when cast, the weather is good enough to dissolve oxygen, cast less during the medication.

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