1, biological control: it is to eat Chlorella with Daphnia (fish worms), provided that there are no fish eating Daphnia in the pool.
2. Salinity control: Chlorella is a narrow-salt organism, which is very sensitive to the increase of salinity. Add salt to the water to remove green algae.
3. Use algaecide: Although algae can be removed, it is harmful to fish and grass because it is a toxic reagent.
4, reduce light: many farms build awnings, which can reduce light and avoid some other pollution.
5. Establish a filtration system: uniformly eliminate algae, ammonia nitrogen, nitrate, suspended matter, etc. Reduce the chance of organic matter being decomposed into ammonia and phosphate by bacteria, and make the water clearer.
6. Ultraviolet sterilization: The use of ultraviolet germicidal lamp is very effective in controlling microbial overgrowth in water. Generally, it can kill all kinds of microorganisms in water within 1-2 days, with little damage to nitrification system, especially in the period of biological turbidity outbreak, which is very effective in sterilizing water, especially for green algae. However, ultraviolet sterilization should not be commonly used, and direct irradiation of fish should be avoided when using it.
The reason why the water in the fish pond turns green:
The water in fish ponds turns green, which is largely caused by the reproduction of Chlorella and microorganisms in the water. Chlorella is a spherical unicellular freshwater algae with a diameter of 3~8 microns. It is an efficient photosynthetic plant, which grows and reproduces by photosynthesis.
They live in fresh water, and with the help of sunlight, water and carbon dioxide, they can divide into four cells every 20 hours, constantly convert solar energy into various nutrients, constantly absorb oxygen from water and release carbon dioxide, and compete with fish for oxygen, resulting in suffocation and death of fish, posing a serious threat to their living environment.