Recently, there are more and more ponds with “green scorpions” floating in the waters and downwinds caused by Ketococcus palustris in Hubei Province. Lighter fishes cause fish to lack oxygen, do not eat food, and are heavily flooded, causing adverse effects on aquaculture production and even causing Reduce production and reduce economic efficiency. In the face of this situation, the following describes the causes, hazards, and prevention and control methods for water concentration.

A large number of knee algae occur

The main cause of water concentration is eutrophication of the pond, excessive fertilization, and excess algae. The algae in water-concentrated ponds are dominated by the algae of the genus Chlorophyta, and the algae of the genus Kaposi is the high-quality bait of the white peony. When the appetite of the white peony is not good, the number of algae is too large after reproduction. If there is lack of oxygen in the water body or the nutrient content in the water body is insufficient, the algae will be aged and died, and the “fructia” will float in the downwind, and the water body will be black when it is particularly serious.

Kyropoda belongs to flagellate algae, flagellates have the following characteristics: 1. Hi-temperature, often in July to September a large number of breeding. 2. Like many organic water bodies.

3. Ponds with high nitrogen content, especially ponds that often use chemical fertilizers, are more likely to multiply.

4. Can exercise, the pond is prone to "cloud water."

5. With phototaxis, sunny morning water is lighter in color, the afternoon is very strong in color.

6. Oxygen production and aerobic capacity are both strong, mainly in two aspects: First, strong oxygen production during the day and strong oxygen consumption at night; Second, strong ability to produce oxygen in sunny days, strong oxygen consumption in rainy days.

Excessive water quality hazards

1. Lead to a lack of oxygen in the pond. When the amount of Ketella algae in the water is not too much, the fish eat and eat normally. With the proliferation of Ketella albicans, the number is increasing. At this time, the water is dark and the transparency is reduced. Microscopic examination revealed that some of the algae died. The other algae had poor viability, and there were few beneficial algae. The number of protozoa increased continuously, and fish fed food decreased significantly and began to float. If we do not take timely measures and encounter rainy days, a large number of deaths of Ketjenococcus will lead to a drastic decline in dissolved oxygen in the water, and the fish will float ahead of schedule. Failure to activate the aerator in time will result in dead fish in the pond. Sometimes even if the aerator is turned on, the fish do not go around the aerator. Instead, they swim around the surface for a few days and the dead fish slowly appear.

2. Increase in toxic substances in water. Aged ponds, thick silt, low redox potential of the sediment will produce ammonia nitrogen, nitrite, methane and other harmful substances, coupled with the death of a large number of knee algae will release harmful substances, causing fish poisoning.

3. Induced fish diseases. The species of algae in the pond is single, and the individuals of the genus Klebsiella are large, belonging to the flagella algae. They have strong oxygen production capacity during the day and strong oxygen consumption at night. This results in extremely unstable water bodies, which causes stress to the fishes, resulting in a decline in their physical constitution and causing air bubble disease. It eventually leads to bacterial infection.

4. The circulation of the pond is blocked. Abuse of disinfectants and insecticides in the breeding process destroys the biological chain of the pond, causing the circulation of the pond to be hindered and affecting the propagation of algae.

Control methods

Preventive methods

(1) Thoroughly sterilize clear ponds, remove excess silt and avoid eutrophication of ponds. (2) Open the aerator in time at noon on sunny days, and early “repaying the oxygen debt” will be beneficial to the material circulation in the pond. (3) Regularly supplement micro-ecological preparations to ponds, such as "More bacteria" or "Three-ring vitality source". (4) Change the base regularly, such as "Fu Di An," "Di Kui An," or "Oxygen at the end." (5) In the use of bactericidal and insecticidal agents, attention should be paid to the amount of water used and the condition of the pond at that time to avoid excessive use and affect the growth of algae. (6) This type of algae is a natural bait for white peony, and it is appropriate to increase the number of larvae that are stocked, and to ingest and use it adequately.

Approach

(1) Stabilize the body of water. "Clear water security" + "Add oxygen at the end" to adjust the hydrolytic toxicity. (2) Strengthen reforms, such as "Fu Di An," and use it a few times. (3) Essential nutrients for supplementing algae, such as "fertilizer." (4) Add aerator.

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