In the adjustment of the agricultural structure, the use of idle land, cold paddy fields, and low-lying fields that are not suitable for farming should be done in accordance with standard fish pond requirements. For fish ponds with poor conditions, measures should be taken: change the ponds to Datang Pond, change the leaking pond to a water pond, change the dead pond to a live pond, and change the thin pond to a fertilizer pond. For the waste ponds, grass ponds, ramps, or earthen pits and low-lying areas left by the bricks and tiles, the fish ponds can also be transformed into a base for the development of Aquaculture. The requirements for the construction of intensive and high-yielding fish ponds are as follows: 1. Area and depth: The intensive culture of high-yielding fish ponds requires an area of ​​4 mu to 10 mu and a water depth of 2.5 to 3 meters. Large fish ponds, because the water surface is often blown by the wind, can increase the amount of dissolved oxygen in the water; surface and bottom water can also use wind convection, is conducive to the decomposition of organic matter, provide good conditions for the growth of fish. The range of activities of fish is large and the life is comfortable, reaching the purpose of “deep water deep pond fish breedingâ€. 2. Tang shape and orientation: The shape of the fish pond is rectangular. Its orientation should be long east-west and north-south width, so that the dike has a small shade and a long sunshine time on the surface, which will help improve the water temperature and the photosynthesis of phytoplankton. The ratio of length to width of fish ponds is best at 5:3. This is not only aesthetically pleasing, but also conducive to feeding and management and pulling operations. 3. Slope slope: The slope of the pond slope is 1:2.5 to 1.3 under water and 1:1.1 to 1.5 over water. 4. Anti-escape facilities: Intensive and high-yielding fish ponds must have complete water injection and drainage systems, and anti-escape facilities should be installed at the inlet and outlet. According to observations over the years, a dike with a height of 0.5 meters was required above the highest water level.
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