The reason why Bailu died in solar terms.

1, summer and autumn changes, the temperature began to drop, the weather turned cold, and the temperature difference between day and night was large, which led to drastic changes in the water environment.

2. After the fry are raised for a period of time, the water environment will deteriorate due to the long-term accumulation of organic matter such as residual bait in the pond and dead plankton in the feces. The water quality is getting worse and worse, the water is turbid, the bottom is black and the bottom is smelly.

3. The aeration equipment in the fry pond is insufficient, and the pond is often anoxic. With the growth of fry and the increase of density, the water body is overloaded.

Fish body reason

1, improper selection of feed protein or a large amount of feeding in the process of breeding, long-term overload metabolism of fish liver, leading to internal organ damage and pathological changes (fatty liver, flower liver, green liver, liver atrophy, spleen atrophy, hepatomegaly, etc. ), resulting in weak fish constitution.

2. Too fast growth leads to the lag of the immune system of fry, which leads to the decline of disease resistance.

3. Drug stimulation (pesticides, disinfectants, antibacterial drugs, etc.). ) lead to poor physique and low disease resistance of fish.

During the Millennium, the water temperature dropped, and the water temperature was suitable for the large-scale reproduction of viruses (reovirus) and bacterial parasites in water. Causes fish to get sick easily.

At the same time, the above reasons lead to a large number of death of Jerusalem artichoke fry, and the death period usually lasts for more than one month. Finally, the water temperature dropped below 20 degrees, and the number of deaths decreased.