What is the algae in the pond? How to prevent the occurrence of this phenomenon?

Friends of aquaculture all know that once algae fall out in aquaculture ponds, the fish and shrimp in the water will be dangerous. if they are not dealt with in time, it will easily lead to rapid deterioration of water quality, death of a large number of fish and shrimp, and great economic losses to farmers! What is the algae in the pond? How to prevent the occurrence of this phenomenon?

First, what is the algae in the pond?

In aquaculture production, excessive reproduction of algae in the pond will inevitably lead to aging and death, and the replacement of the new and the old is a normal phenomenon. However, due to continuous high temperature or air temperature, sudden changes in water temperature, torrential rain, water stratification and salinity sudden changes, caused by a large number of algae death, we commonly known as anti-algae. The so-called anti-algae refers to the death of a large number or all of the algae in the aquaculture water, causing the water color to suddenly become clear or even turbid.

There is often a layer of dead algae floating on the water surface in ponds where algae fall (usually in the shape of yellow floats, and some ponds form an "oil film" at the downwind outlet). The body of water tends to increase in viscosity, with many and large foams, and it is not easy to disperse for a long time, and some of the foams are even dirty khaki.

Second, what is the impact of algae dumping in the pond?

When "algae fall" occurs, first of all, dissolved oxygen will decrease, carbon dioxide will increase, and pH value will drop rapidly; secondly, the decomposition of a large number of dead algae will not only increase oxygen consumption, but also produce ammonia nitrogen and nitrite. This is due to the pond's own self-purification bacteria can not decompose dead algae in time, especially in rainy days. Third, the protozoa in the water will multiply in large numbers and inhibit the growth of algae. Fourth, the lack of algae sedimentation, suspended matter in the water (dust, feces, dead algae, etc.) into a turbid state.

The aging of algae leads to excessive transparency of pond water, which leads to the growth of benthic moss. Moss has strong photosynthesis and strongly absorbs nutrients in water, which limits the growth of phytoplankton and causes a large number of harmful bacteria. The dissolved oxygen in the water decreased sharply, and the ammonia nitrogen and nitrite were too high. And the pond water is crystal clear, which is not conducive to the habitat of farmed animals, which will lead to algal toxin poisoning, hypoxia, disease and death in serious cases.

Third, how to prevent and control the phenomenon of algae falling from the pond?

The prevention and control of algae fall in the pond should strengthen the patrol of the pond, pay attention to the changes of water body and monitor the changes of various indexes of water quality at any time, and take appropriate management measures. We should always pay attention to the weather conditions to prevent sudden changes in the weather leading to algae fall. It is also prudent to use chemical reagents such as disinfectants and pesticides, especially algae-killing products, which can easily lead to the death of a large number of algae if not used properly.

In addition, microecological agents such as Bacillus subtilis, photosynthetic bacteria and aquatic EM bacteria should be used regularly to transfer water and improve the sediment in a planned way, and the time and mode of fertilizer and water should also be grasped. Once the phenomenon of algae dumping occurs in the pond, the aerator should be turned on immediately, and the aerator should be used together to prevent the lack of oxygen in fish and shrimp.

According to the situation of algae dumping, measures such as adding water, changing water or using related products are taken. After the treatment of inverted algae, we should pay attention to fertilizer and water, and cooperate with microecological agents to regulate the water quality.