What is the reason for algae bloom in the pond?

Inverted algae "mainly refers to the phenomenon that a large number or all of the algae in the water body die due to sudden weather changes (typhoons, rainstorms, etc.) (some algae are aging, and the death is not inverted algae). ) or improper aquaculture management, unreasonable drug use, leading to sudden changes in water color, turbidity (mainly yellow turbidity and white turbidity) and even redness. In the pond with abundant algae, a layer of dead algae (usually brown or brown floating floc or "oily film" substance) often floats on the water surface of downward flow. The water body is often viscous, with many and large bubbles that will not disperse for a long time, and some bubbles are even dirty brown. After the occurrence of water bloom, it is easy to lead to anoxia in the pond, deterioration of water quality, stress reduction or anorexia of fish, shrimp and crab, decreased immunity, easy infection and even a large number of deaths.

How to prevent and control?

According to the above analysis, prevention of water bloom can start with daily management:

1, do a good job in the daily patrol of the pond, pay attention to the change of water body at any time, and monitor the water quality index of the pond regularly.

2, always pay attention to the weather forecast, beware of continuous high temperature, heavy rain and other weather mutations caused by algae bloom.

3. Open more aerators to avoid stratification of aquaculture water.

4. The water transparency becomes worse and turbidity begins, which is the prelude to the emergence of water bloom. We can adjust the bacterial phase and algae phase by adding fresh water regularly and purifying water with microbial agents such as Junduo or Yayoule, or we can use it together with Yiqing to improve the bottom material.

5, often according to the actual situation of topdressing, carbon supplement, maintain the stability of water. Pay attention to the timing, it is easy to cause water and fertilizer too early, and it is easy to lose fertilizer too late. Under normal circumstances, topdressing is just right when the water transparency of the four major fish ponds is about 45 cm.

6. For the prevention of algal blooms before typhoons, bacteria and fertilizers can generally be supplemented 3-4 days in advance to prevent algal blooms, mainly to supplement the nutrients needed by algae, and Dongduoduo+brown sugar can be used. When the typhoon comes, it is necessary to ensure that the dissolved oxygen in the pond is sufficient at night, and to ensure the dissolved oxygen in the algae respiration at night, and to prevent the algae from falling because of the low dissolved oxygen at night. Oxygen can be increased by adding aerators and using chemical aerators.