What does cyanobacteria know?

Gram-negative, flagella-free, chlorophyll-a-containing, but chloroplast-free (algae is different from eukaryotes), a large single-celled prokaryote capable of oxygen-producing photosynthesis.

About 2000 species of cyanobacteria are known, and about 900 species have been recorded in China. Microcystis (commonly known as green ingot) and oscillatoria are common in Yaogou area.

(1) Cyanobacteria like high temperature. When the water temperature is 25-35℃, cyanobacteria will grow faster than other algae, so temperature is one of the main factors of cyanobacteria outbreak.

(2) The aquaculture water is eutrophic, and cyanobacteria are easy to grow. The ponds that don't change water frequently are often more prone to cyanobacteria outbreaks.

(3) Organic phosphorus is a necessary factor for the growth of cyanobacteria, and the most direct and fundamental way to control cyanobacteria is to remove organic phosphorus.

4. Harm of cyanobacteria

It affects the transparency of water body and is not conducive to the growth of aquatic plants.

In addition, there are microcystins in cyanobacteria, which are released when they rupture or die, mainly hepatotoxins and neurotoxins, which are extremely soluble in water and difficult to degrade after being dissolved in water. Moreover, microcystin is a growth promoter of "liver cancer" for human body.

Moreover, algae death is a process that consumes a lot of oxygen, so we must be careful to kill it, otherwise the light pond will die and the heavy pond will burst.

(1) Cyanobacteria and other algae are the food of silver carp and bighead carp, which can be treated by feeding (only the quantity can be reduced but not stopped).

2. Avoid pond eutrophication, and cut off the nutrient source of cyanobacteria by using oxidation bottom modification, ferrate and potassium bisulfate double salt regularly.

3. Less decomposition and more bottom phosphorus in the late stage of culture will make the proportion of nitrogen and phosphorus in the pond unbalanced, and organic phosphorus will promote the reproduction of cyanobacteria.

4. Use some beneficial algae regularly from the early stage to stabilize the water body, form a dominant population and inhibit the outbreak of cyanobacteria.

Choose to use it in the morning when the weather is not sultry and oxygen-deficient, avoid the peak period of molting, and use it when the grass and sediment are good, with little risk.

Sprinkle bottom oxide and granular oxygen on the night after killing to prevent hypoxia.

The next day, organic acids and other aqua were used to detoxify the whole pond.

On the third day, beneficial bacteria and algae were added to prolong the frequency of the next cyanobacteria outbreak.

After cyanobacteria died, they sank to the bottom, so the bottom reform must keep up. In the middle and late stage of breeding, most of all the expenses are invested, raised and cherished. Killing cyanobacteria may not be necessary, but it will increase the probability of accidents, which is better, much better.

Author: Cheng Yuhong