In recent days, the author has learned that many fry and adult fishes in tilapia culture ponds have died of rotten flies. Technical staff said that due to more rain this year than in previous years, the incidence of a slight increase, farmers should pay attention to disinfection before and after the injection of insecticide.
"Suddenly, after the heavy rain, there were sick and dead fish on the edge of the pond. It took more than a dozen days a day." Zeng Luo, a farmer in Zengcheng County, told the author that dead fish were mostly rotten and unorganized and parasites were found on the poles. In response, Yu Minghai, a fishery technical engineer of Guangzhou Dequan Fisheries Development Co., Ltd., said that the rainy season is a period of high insect pests, and most of them are trichomonad infections. Copper sulfate and ferrous sulfate can be used for treatment. It is still the peak period of tilapia inoculation. The fry is poorly resistant and more susceptible to parasite infection. According to industry sources, during this time some of the seedlings have emerged more urgently and the frying time of the fry is not enough. The farmers do not disinfect the seedlings before the seedlings are thrown in, causing the fry to easily infect secondary bacterial diseases.
Yu Minghai suggested that farmers should first pay attention to regulating water quality before investment; on the day of seedling investment, iodine preparations should be used to disinfect the seedlings to prevent infection of wounds caused by long-distance transport of fish fry, which in turn leads to bacterial diseases; Three days later, some insecticides were splashed to prevent parasitic infections. "We must also pay attention to the timely increase of oxygen in rainy weather.
The so-called pharmaceutical intermediates are actually some chemical raw materials or chemical products used in the pharmaceutical synthesis process. This chemical product does not require a production license for medicines, and can be produced in ordinary chemical plants. As long as it reaches a certain level, it can be used for the synthesis of medicines.
Explanation: Some chemicals used in drug synthesis
Purpose: Synthesis of medicines
Features: low profitability of production intermediates
Representative: fluorine-containing pyridines, etc.
Field: Medicine
Anti-Influenza Drugs,Api Oseltamivir Phosphate,Intermediate For Oseltamivir Phosphate,Vortioxetine Hydrobromide Intermediate
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