Recently, Wen Xuechao of Hengbu Town, Gaoyou City, reported to the newspaper “Fishing Technology 110†that his family had a 6- to 7-acre pond, which mainly cultivated fish species such as squid, squid and grass carp. The fish species were recently found at 9 am In the past, the floating head was relatively severe. After the sun came out, the phenomenon of floating heads was reduced. As the fish died, about 15 to 20 kilograms of fish were killed every day. After testing, there was no parasitic parasite. The transparency of the pond water was more than 50 cm and the water color was reddish. After changing the water in the pond, the effect is not obvious. He asked: What is the fish in the pond? How to treat?
The reporter interviewed Xue Hui, the senior engineer of the Director of the Disease Control Research Center of the Jiangsu Provincial Institute of Freshwater Fisheries. Xue Hui, after learning about the condition of the Wenzhou Chaoshui fish, analyzed that this season's fish died less due to illness and can be ruled out by disease factors. death. Although the number of dead fish in ponds has not been reduced, the relevant fishermen and technicians can be asked to determine the exact dissolved oxygen in the pond by detecting the dissolved oxygen in the water and determine whether the floating head of the fish is caused by lack of oxygen in the pond water. The solution to the problem.
“If the dissolved oxygen in the water reaches the standard, it may be that the quality of the feed before the winter is poor, resulting in poor disease resistance and weak resistance of the fish. The death of the fish may be a stress response to the recent low temperature environment.†Xue Hui According to the introduction, the content of animal feed, vitamins, minerals, etc. in feeds can be increased, and fish body resistance can be enhanced.
In addition, because the water color of the Wenxue Chaojia Pond is red, Xue Hui said that the red water in the pond is generally caused by excessive breeding of naked dinoflagellates, but the current climatic conditions are not suitable for the breeding of naked dinoflagellates, so the red water may be caused by Exogenous water pollution.
Xue Hui said that high transparency of the water body should not be the main reason for the death of this fish. The transparency of pond water in winter is generally higher, but attention should be paid to changes in pond water quality and corresponding measures should be taken in time.
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