First, the standard of high quality shrimp
1. Selection of Shrimp-Free Shrimp Breeding Shrimp with no specific pathogens Shrimp breeders have a low incidence and are preferred shrimps for production. However, the disease resistance of the introduced SPF shrimp after several generations of breeding will decline, and should be updated as necessary.
2. The medium-sized shrimp of P. vannamei grows into adult shrimps for more than 12 days. After 10 days of cultivation, the baby shrimp can be sold. At this time, the specifications are 0.4 to 0.6 cm, and after the second desalination (temporary After raising the shrimp can grow to 0.8-1.5 cm. Shrimp seedlings with a stock of 0.8 cm or more can obtain higher survival rates.
3. After desalting, shrimps purchased from the nursery are desalinated to improve their adaptability to fresh water. The desalted shrimp seedlings were full of food in the stomach and agile, suggesting that the shrimp seedlings were able to adapt to live in fresh water after being diluted, and the survival rate after restocking was higher. If the desalination rate is too fast before sale, the salinity of the water body will fall from 10 to 20 Shaxi speed, which will result in a decline in the quality of shrimp seedlings. The survival rate of post-stocking shrimp seedlings will decrease, and they will be susceptible to disease. Therefore, attention should be paid when buying seedlings. The seller's dilution method to avoid loss.
4. The appearance of the body surface without abnormal health shrimp body color transparent, thick seedlings, no parasites, black spots, no black eyes, no white spots on the head chest, no broken, no red tail and red body phenomenon. Abnormal body color, high incidence of black spotted shrimp seedlings, should be carefully screened when buying seedlings.
5. Vigorous strong shrimp seedlings have strong activity, can swim at the top of the water, there is no sinking phenomenon, and there is a strong impeachment after leaving the water. If the shrimps swim out of the group, it indicates that the constitution is poor, and there may be morbidity, so prevention should be carried out in time.
6. The appetite of normal shrimps was very good, and the phenomenon of catching food was obvious. After feeding the food for a few minutes, the stomach could see the food pellets. This phenomenon shows that the shrimps are relatively healthy.
Second, shrimp cultivation
1. Secondary diluting of prawns is one of the currently implemented technical measures for freshwater aquaculture. Temporary rearing is also the most suitable time for secondary desalination. Temporary holding ponds are usually built on the side of the aquaculture pond close to the water source. Secondary desalination refers to the addition of seawater to a holding tank, or the addition of sea crystal or sodium chloride, so that the salinity of the water in the holding tank reaches 2 to 5, and the low salinity water environment is favorable for the purchase of shrimp seedlings from seawater. Transition to freshwater aquaculture. It should be noted that the amount of sodium chloride added should not exceed 5 kg/m3, as excess sodium chloride will cause serious imbalance of water ions and the shrimp will also die in large numbers.
2. Temporary holding period can not be too long, usually 10-15 days is appropriate, because the growth of white shrimp in South America is faster, long holding period will make the water space is very crowded, and the accumulation of harmful substances in the water will be As the water environment deteriorates, the constitution of the shrimp will also decline. Therefore, the long-term conservation time will not benefit the subsequent cultivation.
3. It is very important to regulate the basic bait culture during water conservation. However, if excessive fertilization is performed in the bait cultivation process, the mass reproduction of zooplankton in the water will reduce the transparency and increase the pH value. After the water quality ages, the shrimp will cause a large number of deaths. Although the abundant water in the water body is conducive to feeding and growth of the shrimp seedlings, it is harmful when exceeding a certain limit. Especially when the transparency is lower than 10 cm and the pH is higher than 8.7, the growth of the shrimp seedlings will be affected, and the incidence rate will also be affected. It will be greatly improved. Therefore, adjusting water quality is one of the technical aspects that need to be taken into account during the period of South American white prawn.
4. Reasonable use of drugs to reduce the incidence of shrimp disease, the rational use of drugs is very important. The first is to strictly sterilize shrimp ponds prior to planting. The most commonly used method is 100-150 kg/mu calcined milk and the whole pool is splashed with water: water can be injected after two days, and then 5-20 kg of bleaching agent can be used per acre after entering the water. Disinfect the body of water. After that, add some new water every 15-30 days, and use 0.2-0.4 g/m 3 water disinfection water to disinfect the pool water, or use 0.1-0.4 g/m 3 bromochloride. Hein was splashed and disinfected. If water quality is deteriorated in the breeding process, disinfectants should be used first. Two to three days later, the whole pool should be splashed with “water replenisher†and 2 ‰ “virus stars†should be added to the feed. Two weeks is a course of treatment. Sprinkle "biological water" and other biological agents within 15 days should not use disinfectants, including iodine preparations and antibiotics, etc., in order to prevent the failure of biological agents. However, after each change of water, re-sterilization should be considered and biologics should be replenished after 3 days.
Active Pharmaceutical Ingredient (API)
We are a manufacturer and supplier of raw materials, intermediates for pharmaceuticals, as well as Active Pharmaceutical Ingredient (API). Our focus is on providing customers with high quality, fair priced products, coupled with our broad range of technical know-hows on fundamentals, vast industrial experience on applications, professional expertise on health and safety, and efficient logistics on customer services. We have established good market for our intermediates in India, Korea and EU. Besides of their intermediates, we can also synthetize the API directly. We also have some API by fermentation, Polymyxin B Sulfate is one of them and we are developing more APIs as well.
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Active Pharmaceutical Ingredient (API)
Active Pharmaceutical Ingredient,Polymyxin Sulfate,Ziprasidone Hcl,Polymyxin Sulphate
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