Recently, Shishi Town, Gaoyou City, Shi Shihua called the newspaper “Fishing Technology 110†to reflect that his family had a total of 25 acres of pond culture Macrobrachium rosenbergii, after the rain found that the cyanobacteria in the pond more, generally less early morning, more afternoon phenomenon Although there are 2 oxygen aerators in the pond to increase oxygen, there are also a small number of Macrobrachium praecox showing the phenomenon of hypoxia. He asked: How did the blue algae in the Roche shrimp pond clear? How to relieve the phenomenon of "Yuntang"?
The reporter interviewed Sun Guixi, deputy director of the Agricultural and Forestry Bureau of Gaoyou City. Sun Guixi said that the accelerated growth of cyanobacteria in pond water is mainly related to the eutrophication of the water and the increasing temperature. Generally, the temperature reaches 28°C or more, and the farmers feed long-term high protein levels. Feed (nitrogen and phosphorus content in the pond is too high) will accelerate the growth of cyanobacteria.
How should the cyanobacteria in the pond be removed now? Sun Guixi said that the current cyanobacteria in the pond are more difficult to remove, except for the artificial removal of cyanobacteria after it has been blown to the corner of the pond in windy weather, and there are no other special effects removal methods. For the prevention of cyanobacteria in the ponds of Macrobrachium rosenbergii, they are also conducting related research. There are mainly three kinds of schemes currently under discussion. One is the cultivation of 10% to 20% area of ​​water spinach in the pond of Macrobrachium rosenbergii, absorbing and utilizing water in ponds. Excess nitrogen and phosphorus; secondly, the aquaculture ponds in Gaoyou City are mainly east-west oriented, and the aquatic plants are planted on the east and west sides of the pond by about 10% each. In the presence of wind, the blue algae in the pond can be filtered and purified. Water quality; Third, in the high-density Roche shrimp breeding pool, put 10 to 20 fish per acre, biological purification of water quality.
Sun Guilu said that the occurrence of “flood pond†phenomenon in Macrobrachium rosenbergii is mainly caused by excessive blue-green algae on the surface of pond water, resulting in low dissolved oxygen content in the water body. However, general Roche shrimp ponds are not prone to this phenomenon. There are only 2 aerators in the pond. The oxygen boosting capacity of the 2 aerators cannot meet the demand of dissolved oxygen in the water in the high temperature season of Macrobrachium rosenbergii. The number of aerators should be added properly or the “Yun Tong†should appear in Macrobrachium rosenbergii. Phenomenon prompt use of chemical oxygenation agent oxygenation, but also timely use of microbial agents to improve the water quality of the pond.
“Because the current large-scale oxygen aerators are used in the Roche shrimp pond, there are certain limitations to the oxygen boosting effect of the ponds.†Sun Guilu said that they are currently deleting the aerators that are more suitable for the prawn ponds of Macrobrachium rosenbergii. Some disk-type microporous aerators were tried before, but due to the relatively large number of pull-ups of Macrobrachium rosenbergii and the inconvenience of use, some microporous aerators and running water machines are currently being tested in the Macrobrachium rosenbergii pool. This type of aerator with only 60 watts is normally turned on all day in July-September, and the oxygenation effect is better.
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