Several measures to improve old fish ponds

1, bottom quality improvement. The bottom sludge of the pond is preferably loamy, and its fertilizer retention and water retention properties are strong. Sand has poor water retention properties; clay is turbid, and toxic gases and large amounts of oxygen are often produced due to over-thick humus fermentation, which is also not convenient during the pull-net operation. The improvement of sandy sediment can be used to trap 40 centimeters of saline soil or clay at the bottom of the pond, and at the same time pay attention to the leakage of the wall; the improvement of the clay sediment can remove excess silt and be treated with lime. 2. The area is widened. Larger water surface, relatively stable water quality, rich contents of dissolved oxygen and food organisms, and a wide range of fish activities are conducive to the growth of fish. Some ponds are not regular in shape. They can be excavated from the mounds and empty puddles around the pool to make the pool form a standard rectangular shape. At the same time, the area is enlarged. Some two small pools can be connected together to dig the middle pool. Increase the area (combined into two); conditions can be used machine or artificial excavation to make part of the pool weeks into ponds to increase the pond area. According to local conditions, try to expand the pond area. It is advisable to have an area of ​​approximately 0.66 hectares for food ponds. 3, the depth deepens. The deep-water environment is conducive to fish adapting to the seasonal changes of the climate and stratified life of different fishes, and increasing the yield by increasing the type, number, and survival rate of stocking. The pond can be deepened and the bottom mud can be excavated. The bottom mud can also be laid on the pool bottom. The bottom mud can also be used as agricultural fertilizer and digging the earth to fill the height of the pool. When the area is enlarged, the mud can be piled in the pond to increase the depth of the pond. 4, water change "live." The rapid growth of fish requires that the water quality be “fat”, “live”, “tender”, and “cool”, and “live” refers to the fact that water quality nutrients and dissolved oxygen are very rich and non-toxic, and drainage and irrigation of water is convenient. A pond of dead water raises little live fish. The fish pond requires some uncontaminated rivers, lakes and water bodies to divert water. When a well water is used as a water source, aeration is required, and the turbid water body is to be clarified and improved with quicklime. The domestic sewage is to be treated through a fermentation pond or quicklime or bleaching powder. Water source requirements do not compete with farmland water, irrigation and drainage equipment can be filled and drained, and can prevent flooding, and block the slag mesh at the inlet of the pond (about 5 mesh per square centimeter).

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