What are the causes and treatment methods of pond algae die-off
Friends in aquaculture often encounter the phenomenon of pond algae die-off, and this phenomenon often causes heavy losses for many farmers, especially during high temperatures and when there is a lot of rainfall, which can easily cause water stratification and sudden salinity changes, thereby triggering mass death of algae and causing mass death of the aquaculture species. So what causes pond algae die-off? How should it be handled? Let us learn about it together.
I. Harm of pond algae die-off
When pond algae die-off occurs, dead algae float on the water surface, generally called yellow floating matter, and some also forms a layer of oil film at the downwind outlet of the pond, which often leads to increased water viscosity and a lot of foam, with some foam being a relatively dirty earthy yellow. After algae die in large numbers, carbon dioxide cannot be absorbed, and after dissolving in water it forms carbonic acid, causing the pond pH to be too low, while the decomposed dead algae also consume a large amount of oxygen, worsening pond hypoxia, and later also produce toxic and harmful substances such as hydrogen sulfide, ammonia nitrogen, and nitrite, causing acute poisoning and death of farmed shrimp and crabs.
II. Causes of pond algae die-off
1. Sudden climate changes
Sudden weather changes can alter water quality, and the aquaculture species in the pond will have stress reactions, especially after continuous heavy rain, changes in pond water temperature and pH value will cause mass death of algae.
2. Hypoxia
Hypoxia in the pond water body can cause acute death of all organisms, not only algae, and the farmed aquatic products will also die within a short time. This situation mostly occurs in stuffy summer weather.
3. Improper medication use
In the process of aquaculture, the use of large amounts of disinfecting and sterilizing products, insecticides, and heavy metal salt products will affect the growth and reproduction of algae, thereby causing algae die-off.
4. Large water exchange
Large water exchange in the pond causes stress to the water body, and especially when water quality is poor, the possibility of algae die-off is relatively high.
III. Treatment methods
If algae die-off occurs, when an aerator is available, promptly turn on the pond aeration equipment for emergency oxygenation, then carry out a large water exchange, generally draining water outward during the day and adding water inward in the evening. Apply super-concentrated organic acids and Navisu to detoxify and resist stress, and use potassium monopersulfate to improve the bottom and improve the bottom environment. When the pond is in a low-oxygen environment, the number of anaerobic bacteria multiplying increases, so a disinfection should be done appropriately, and iodine preparations or Bdellovibrio can be used. Adding nutritional products such as Navisu and Ganlijian to the feed can remove toxic substances from the body of aquatic products and regulate the gastrointestinal tract.
The above is an introduction to the causes and treatment methods of pond algae die-off. We hope it can help you. To learn more related knowledge, please follow us.