Chrysanthemums should not be used in crab pools

On December 29th, 2011, Zuo Chenghua of Zhouzhuang Town, Xinghua City called the newspaper “Fishing Technology 110” to report that he had a total of 10 mu of water. Since there was just Qingtang, there was relatively little water in the pond, and there was only 3 to pond water. 4 acres, water depth 20 to 30 centimeters, 20 days ago, the whole pond used 3,400 milliliters of pyrethroids for clear ponds, and 20 days for crabs to be planted. Whether the pyrethroids used in the earlier period had an effect on crab species ? How to solve the residual pyrethroids?

It is understood that pyrethroids are an efficient, broad-spectrum, low-toxicity, and biodegradable synthetic insecticide. When deltamethrin and cypermethrin are used as fishery medicines, they can be used to treat fish, fish, and fish. Parasites such as cockroaches are parasitic, but crustaceans such as crayfish, river crabs, and crayfish are sensitive to pyrethroids and are prone to death.

The reporter interviewed Xue Hui, director of the Fish Disease Control Research Office at the Jiangsu Provincial Institute of Freshwater Fisheries. Xue Hui told the Zuo Chenghua family about the condition of the crab pool. He said that if the pond is not directly processed and the crabs are directly introduced, it may be Affect the survival rate of crab species and the growth of the later period. At present, by extending the time of the crab species or draining the water in the pond first, the 3 to 4 mu water surface is isolated by fences, and the influent water concentrates to cultivate the crab species. The other parts of the pond are planted with aquatic plants, which not only facilitates the dispersal of pyrethroids in the ponds, but also prevents the crab species from damaging the young shoots of the aquatic plants and improving the culture environment. After the crabs have been shelled for the first time in April, they will be able to remove the fence for large-water culture. At this time, the residues of pyrethroids in the pond will not substantially affect the growth of crab species.

Can crabs and other crustacean breeding ponds use pyrethroid insecticide ponds? Xue Hui said that since pyrethroid insecticides can directly kill crustaceans such as crayfish and river crabs in ponds, clear ponds should not be used. However, if the previous year’s breeding of river crabs, crayfish, etc. occurs very seriously, in order to avoid affecting the second year of breeding, pyrethroid insecticides can be used in clear ponds, but there should be sufficient period of drug dissipation, generally Should reach 60 days or more.

In addition, the reporter also interviewed the Zhang Zhanchang, director of the Xinghua Fisheries Technical Guidance Station. Zhang Zengchang stated that at present, the pond culture environment of Zuo Chenghua’s family is not suitable for the release of crab species, and the treatment of water intake after the first release of water in the crab pond is timely. After flooding, the whole pool was detoxified with sodium humate. When the crabs are released, the water should be tested first. After everything is normal, the seedlings should be released.

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