Prior to the release of cultured seedlings, the sludge deposited in the culture tank (field) shall be removed, and the bottom of the tank shall be air-dried so as to achieve the purpose of disinfection and detoxification. Avoiding the chain hazard caused by the use of highly toxic drugs, this method is worth promoting. It is understood that this method works well and not only effectively eliminates the germs that are harmful to the cultured species, but also adopts the method of network filtration when water is contained. It can also effectively prevent the entry of breeding natural enemies. The most important thing is to fundamentally avoid it. Drug contamination has provided a reliable guarantee for the long-term healthy development of the aquaculture industry. However, due to the relatively large investment in dredging and disinfection methods and the inconvenience of direct application of pesticides, this method is only used more often by some established old farmers, and most of these temporary farmers tend to be dry for one year. The idea of ​​the year, reluctant to invest, still using the drug method, and the use of drugs is not standardized. From this point of view, in the development of aquaculture, all localities must plan in a unified way so that the aquaculture industry in China can develop in a healthy and long-term manner and become one of the most dependable industries.
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