1. Clearing and disinfection of ponds. 15 days before stocking, the fish should be given a small amount of water, and then be splashed with quicklime of 75 to 100kg/mu or bleached powder of 5 to 7kg/mu.
2, grasp the timing of stocking. The best time for stocking is the spring water temperature of 7 to 8°C. At this time, the fish scales are tight and their vigor is weak. Fish are not easily injured and the survival rate is high. When stocking should be carried out on sunny and windless days, rain, snow, and freezing weather will freeze the fish, and it is not suitable for stocking.
3, choose high-quality fish species. Should be selected neat specifications, physical fitness, full muscle, bright color, scales, fins integrity, no injury-free fish species stocking, in order to improve the survival rate. It is necessary to increase the stocking ratio of large-scale fish species as far as possible so that the fish and the morning market can be balanced and supply and increase output and efficiency.
4, prevent fish from injury. Due to the relatively low water temperature and temperature during the spring season, fish injures will not recover easily and cause fish diseases. Therefore, in the fishing, transportation, stocking and other aspects should be carefully handled to prevent fish injuries.
5, polyculture with a reasonable. When the main cultured fish and breeding cultivars are well-established, reasonable collocation can be achieved. Generally, the main fish can account for 60% to 70%, and the ration fish can account for 30% to 40%.
6, fingerling disinfection. Disinfection of fingerlings can reduce the occurrence of diseases and increase the survival rate.
API Powder is fully defined in ICH Q7A as any substance or mixture of substances intended for use in the manufacture of pharmaceutical products and, when used in pharmaceutical products, as an active ingredient of pharmaceutical products. Such substances have pharmacological activities or other direct effects in the diagnosis, treatment, symptom relief, management or prevention of disease, or can affect the function or structure of the body. The active ingredient of a medicine. Only when an API is processed into a pharmaceutical preparation can it become a medicine for clinical application.
According to its source, apis are divided into chemical synthetic drugs and natural chemical drugs.
Chemical synthetic drugs can be divided into inorganic synthetic drugs and organic synthetic drugs. Inorganic synthetic drugs are inorganic compounds (very few are elements), such as aluminum hydroxide and magnesium trisilicate for the treatment of gastric and duodenal ulcer, etc. Organic synthetic drugs are mainly made of basic organic chemical raw materials, through a series of organic chemical reactions and drugs (such as aspirin, chloramphenicol, caffeine, etc.).
Natural chemical drugs can also be divided into biochemical drugs and phytochemical drugs according to their sources. Antibiotics are generally produced by microbial fermentation and belong to the category of biochemistry. In recent years, a variety of semi-synthetic antibiotics are the combination of biosynthesis and chemical synthesis products. Among apis, organic synthetic drugs account for the largest proportion of variety, yield and output value, which is the main pillar of chemical pharmaceutical industry. The quality of the API determines the quality of the preparation, so its quality standards are very strict. All countries in the world have formulated strict national pharmacopoeia standards and quality control methods for the widely used APIS.
Specific API after processing -- pharmaceutical preparations
The term API is used mainly in relation to the finished product. Mainly raw materials obtained by chemical processing means, supply raw materials for the production of finished drugs. For example, cefpirome sulfate for injection is a drug, then cefpirome sulfate is an API
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