2. If the water quality is good, the dissolved oxygen is rich, and the water temperature can be controlled below 20 degrees, you can consider breeding cold-water fish, such as red squid, but the breeding technology is high.

3. Using mountain spring water to raise fish, the appropriate method is to introduce mountain spring water into the built pond and ensure that the ponds can be interconnected to maintain the fluidity of pond water. When the pond is full of running water, its oxygen content will increase, which is easy to increase the culture density.