Treatment of muddy water in Loach pond in rainy season

In April and May every year, when the northeast monsoon changes to the sub-southern monsoon season, the temperature changes greatly and the rainfall increases, which often makes the Loach pond whose water color changes from brown and green to milky white. This situation is mainly caused by sudden changes in the weather, the death of phytoplankton, lack of oxygen, or the explosive reproduction of zooplankton and the ingestion of large amounts of algae. If the pond is highly transparent and the reproduction number of phytoplankton can not meet the needs of zooplankton, it will eat up the phytoplankton and lose the original water color and become muddy. Because the color and transparency of the water in the pond are determined by the species and number of phytoplankton in the pond.

The harmfulness of turbid water lies in the lack of oxygen in the pond. Because the main source of oxygen in the pond is the photosynthesis of phytoplankton. It is reported that the oxygen content produced by phytoplankton photosynthesis accounts for 91.3% of dissolved oxygen income in seawater ponds, while atmospheric diffusion accounts for only 5.3% of dissolved oxygen income in ponds. 7.8%. The turbid water in the pond means that there are very few phytoplankton in the pond, of course, there is very little photosynthesis, and the production of oxygen is naturally reduced.

It is precisely because June and July are rainy, rainy and torrential rain seasons. This kind of weather sunlight weakens, the photosynthesis reduces, the oxygen supply also reduces, in this kind of bad weather, if the daily management work is not good, the Loach is easy to get sick. Loach farmers, who lack scientific knowledge, are at a loss to deal with this kind of water color. In fact, it is not difficult to recognize its attack principle and solve the problem of turbid water. Turbid water not only affects the respiration and growth of Misgurnus anguillicaudatus due to the decrease of oxygen supply, but also leads to the deterioration of water quality. Because there are a large number of Misgurnus anguillicaudatus excreta, residual bait and biological corpses in the bottom of the pond, if these substances are easy to oxidize when the oxygen content is sufficient, harmful substances such as ammonia nitrogen, nitrous acid and hydrogen sulfide will become less and less. Under the condition of anoxia, the reduction reaction of pond sediment increases, and the harmful substances become more and more, which leads to Loach stress and disease.

Muddy water can be treated as follows:

1. Use disinfectants to kill some zooplankton. Commonly used quicklime, the concentration is 20ppm (20 grams per cubic body of water, if the water depth is 1 meter, about 13 kilograms of quicklime per mu). Quicklime is first dissolved in water, diluted with water, sprinkled evenly throughout the pool, and the water will become clearer after the use of quicklime. Other disinfectants can also be used, but their concentration must be based on the safety of Loach.

2. Stop feeding 1mi 2 meals. The aim is to starve Loach, prey on some zooplankton, reduce the number of zooplankton and facilitate the cultivation of algae.

3. Change water 5m / m 10cm. The purpose of changing water is to replenish algae species. Because there are few algae in turbid water, it is more difficult to cultivate algae with fewer algae species, so it is necessary to increase the content of algae species to facilitate fertilizing water, so that algae can be cultivated in a short time. If your adjacent ponds are raising shrimp or fish, the water color is good, and there are no other diseases, you can draw some to supplement algae, the effect is also very good.

4. Fertilize immediately. The fertilizers used try to use inorganic fertilizers instead of organic ones. In recent years, many Loach farmers have reflected that the incidence of Loach is more likely to be caused by the use of organic fertilizer and water.

5. Unicellular algal auxin was used. It is prepared according to the special nutritional requirements of unicellular algae and contains highly active nitrogen, phosphorus, potassium, silicon and other nutrient elements, which is conducive to the reproduction of unicellular algae and has a long validity period. The dosage is also small, the general water depth is 0.6 meters, 1.5 kilograms per mu can be put. The price is also cheap, usually 8 yuan per mu. It is easier to use, as long as water is added to dissolve, dilute and sprinkle the whole pool. The effect is also quick, the water color will turn brown and green within 24 hours, and achieve the desired effect within 48 hours.

Fertilizer and water should be carried out on sunny days in the morning, but not on cloudy and rainy days.

6. Combined use of microbial agents, such as Bacillus, photosynthetic bacteria and EM bacteria.

7. In addition, the effect is better by applying some zeolite powder and using aerator reasonably.

In a word, turbid water does great harm to the cultured Loach. When it first appeared, the Loach had no obvious abnormal symptoms, but if it was not dealt with in time, the consequences would be unimaginable. Be sure to find and deal with it in time, change the color and transparency of water in time, maintain the ecological balance of aquaculture water, and prevent the occurrence of Loach disease.