Also write the method of fish pond: the big carp, which is nearly 1 meter, is not like rivers and lakes, and it is difficult to get it in a short time. For example, the small fish caught by raising will not grow up even after a few years (because of varieties, environment, feed and other reasons). Water plants and big fish should be used to intercept the soil and sand in the water, which are distributed at the bottom of the pool in shallow water for more than ten years. In two years, a big fish will be born. Because there have been eggs of big fish in this soil before, the fry of big fish will be born when you get water.
Personally, I think it's not just the varieties in the original text. I () added my own environment and feed reasons are also very important aspects. A large amount of shallow water soil not only brought fish eggs, but also improved the water quality of fish ponds, brought aquatic plants, algae, shrimps, insects and other foods and various favorable factors to fish, and formed a relatively good environment for fish to survive.
This is why raising crystal shrimp and some fish now costs money to buy sediment.