The fish pond water is very green, why did it burst into red overnight? What should be done after the red explosion?

In July and August, the weather is unstable in many places, with rain and sunny days. At present, the water temperature in most ponds is above 20 degrees, and the cultured fish and shrimp will enter a rapid growth stage. Affected by weather, breeding and other aspects, red water will be found if the pond is not handled well during this time! If you do a microscopic examination, you will find that all red ponds have the same feature: there is gymnodinium in the water!

Then, the water color of a good pond itself is yellow-green. Why does it suddenly turn red and there are so many gymnosperms? In fact, Gymnodinium is also a common algae. Microscopically, it is an algae with a tail and a hard shell, which often appears in fish ponds and shrimp and crab ponds in early spring and autumn. When there are many other beneficial algae, the number of gymnosperms in the pond is very small. For example, Gymnodinium has lower requirements for water quality and stronger vitality than beneficial algae species. Generally speaking, the weather or water quality changes have little influence on Gymnodinium. Once the environment is suitable, it will multiply in large numbers and gradually form dominant species.

Three conditions for the outbreak of Gymnodinium:

1. Algae species: For example, artificially changing water, bringing some exotic Gymnodinium into the pond, or there are Gymnodinium species in the pond. When the environment is unstable and beneficial dominant algae species die, gymnodinium is easy to grow in large numbers;

2. Appropriate water temperature: For example, when it rains continuously, the water temperature drops, and beneficial algae grow slowly or even die in large numbers. The water temperature of about 20 degrees is especially suitable for gymnosperms to grow easily. Moreover, Gymnodinium has two tails, and its swimming ability is strong, which can rob other algae of nutrition and light, and its growth and reproduction speed is much faster than other algae.

3. There is almost no competition among algae. The weather is unstable, there is much rain, and beneficial algae and fungi are easy to die in large numbers. If beneficial algae and fungi are not cultivated in time, Gymnodinium will have more nutrition and space, which will eventually lead to Gymnodinium becoming the dominant group for Gymnodinium to absorb and reproduce more fertilizers. More fertilization at this time will only make the red color worse!

In the first-line culture, we found that some early ponds were not fertile or the fertilization effect was not ideal, and red water was more likely to appear. In other words, the early water thin pond mouth is prone to "red water"! For the red water caused by excessive reproduction of Gymnodinium sp., because Gymnodinium sp. is absolutely dominant in aquaculture water, it is difficult to directly cultivate other beneficial algae, so it is necessary to treat harmful algae first, and then carry out the operation of cultivating algae.

The suggestions are as follows:

1. Add water with fresh water (1 bottle 3-4/ mu) on the first day, and then kill algae in one third of the fish pond (downward flow). At night, it is necessary to turn on the aerator and aerate with multi-effect aeration sheets to prevent water and oxygen shortage at night, which requires 2-3 mu per bag. Because algae have phototaxis and concentrate in the middle and upper layers of water, the calculation of algae-killing drugs only needs to consider the area;

2. The next day, detoxicate the water with fruit acid appetizing and detoxicating liquid, each bottle is 2-3 mu, and remove microcystins produced by algae death and decomposition, which is convenient for the subsequent algae culture operation.

3. On the third day, it is possible to introduce some fresh algae seed water rich in algae and cultivate algae with algae seed and fertilizer. Generally, as long as the weather is fine for three or five consecutive days, and the methods and products are in place, the water color will soon return to normal!