“Luan Yuan, you have iced the fish pond and need to be dealt with immediately. Otherwise, lack of oxygen in the water will not only affect the growth of the fish, but it will also lead to the death of the fish! I will talk to you about the management techniques of winter fish ponds.” On the morning of December 9th, when the senior engineer of aquaculture of the Nanjiang County Fisheries and Aquaculture Bureau came to the fish pond of Yuan Congguo, a fish farmer at Jintai Village of Liuba Village, Lao Yuan said that during the winter, the amount of fish activity was reduced. Although the oxygen demand was not high, due to ice in fish ponds, the surface of the water could not directly dissolve into the oxygen in the air, and plants such as aquatic plants in the water were reduced in temperature and photosynthetic. Weakening leads to a decrease in oxygen production and it is very easy to cause oxygen deficiency in water. In order to ensure the growth of fish in winter, special precautions should be taken to prevent oxygen depletion in fish ponds. The specific methods are as follows:

After the ice-breaking, oxygenated water surface is frozen, it is necessary to open the ice surface every morning and evening. Generally, 5 to 6 square meters of ice eyes should be opened per acre of fish ponds. At the same time, the mashed ice cubes should be removed. So as not to quickly freeze again.

When the snow is removed during the winter, if snow is encountered, the snow on the ice surface of the fish ponds should be promptly removed so that sunlight can reach the fish ponds and ensure the normal photosynthesis of the green plants in the water.

In addition to adding fresh water during the wintering season, in addition to maintaining the highest level of oxygen in the fish, it should also regularly inject new water to improve the fish's living environment and increase dissolved oxygen. Usually every 15 days to 20 days. If the water quality of the pond deteriorates and aging occurs, the old water and harmful substances in the pool should be promptly discharged. Each change of water volume is 1/3 of the original pool water, and then the new water is injected in time.

Appropriate fertilization When ponds are lean, apply a certain amount of inorganic fertilizer at noon on sunny days. In this way, it can not only promote the growth and warmth of phytoplankton in water, but also increase dissolved oxygen in water through photosynthesis. Fertilizers need to contain nitrogen and phosphorus.

The purpose of regularly stirring the pond is to turn the sediment and mix the upper and lower bodies of water to promote the rapid decomposition of harmful substances at the bottom of the pond, while at the same time ensuring that the fish will not be deprived of oxygen during the wintering period. The method is to stir part of the bottom of the pond with bamboo rods at noon on a sunny day and stir the other part of the pond bottom over time.

Sprinkle the chemicals and regularly put appropriate chemicals such as lime and bleach to the pond to increase dissolved oxygen in the fish ponds and improve water quality.

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