2. Water source and water quality: The pond should have good Shui Yuan conditions, which is convenient for frequent replenishment of fresh water. Due to the high stocking density, large feeding amount and large fertilization amount, the dissolved oxygen in intensive ponds is often insufficient, and the water quality is easy to deteriorate, which may easily lead to hypoxia or even a large number of fish deaths, so a good water source is very important.
Pollution-free rivers and lakes are the best water sources with high oxygen content and good water quality, which are suitable for fish growth. Of course, well water can also be used as pond water source, but the water temperature and dissolved oxygen are low, but one advantage is that the content of organic matter and pathogens in water quality is low. If well water is used as the water source, it is best to let the water flow through a long canal or set up a solar pond, which can increase the dissolved oxygen in the water body. It is also possible to set a water receiving plate at the water inlet, and then the water falls on the water receiving plate and splashes and flows into the pond, which can also achieve the effect of increasing oxygen. The other is to try to avoid river water with sewage discharged from factories and mines as its water source.
3. Pond area: Although some small ponds (2-3 mu) can also achieve high yield in production, after all, this pond cannot be used as a pond bank because of its small water body, unstable water environment and too large occupied area, which reduces the water surface area of cultivation and is not cost-effective. However, large surface fish not only have a wide range of activities, but also have the function of increasing oxygen to the water body under the action of wind, which can promote the continuous convection (mixing) of the upper and lower water layers with the help of wind, thus improving the environment of the lower water body and making the water quality more stable, which is also the reason why we often say that wide water raises big fish. Because of this, if we can adapt to local conditions, it is suggested that the culture area of a single pond should be around 10 mu. If it is too big (more than 30 mu), it is not convenient to feed, which is easy to cause uneven eating of fish and is not conducive to net-pulling, so it is not widely used.