Which is the best feed for Penaeus vannamei in China at present?

Recently, I want to raise some South American white prawns, but I don't know which shrimp feed to choose. There are too many brands. Thank you for your comments. Shrimp food is not absolutely good or bad, some shrimp should be suitable for the place, but also according to your stocking density. Culture environment. Southern shrimp, Guangdong Hengxing feed should be good. I'm mainly in the north. There are Tangshan Zhongtianqin, Yantai Dale, Qingdao Unification, Qingdao Zhengda, Tianjin Tongwei, etc.-I heard that the feed in Guangdong is very good, what do you think? shrimp ingredients as far as possible to choose large manufacturers Hengxing, Guangdong are good-not the best Only better. There is no absolute good, only relative bad. -East China doesn't seem to be in line, is it? Feed is good or bad one is the process of a formula, Guangdong's technology and formula technology are very mature, there are several doctoral and master's support. -Bufeng's should be the best. Southern Bufeng, Guangdong and Hailong are all good. Hengxing's market has shrunk a lot.-Haida is also very good! First, there are many factors causing soft shell disease of Penaeus vannamei, and the main factors may be as follows: 1. Lack of bait for a long time makes the shrimp hungry. 2. The proportion of feed nutrition is not balanced, and the ratio of calcium to phosphorus is not appropriate. A lot of agricultural land is fed as feed, but these feeds often do not meet the requirements. 3. Feed rotten and deteriorated feed. 4. The content of dissolved phosphorus in pond water decreased, and the phosphorus intake of shrimp was insufficient, and phosphorus was the main element in the process of crustacean formation and calcification. 5. The culture density is too high, the culture environment is bad, and the water quality deteriorates, which leads to the softening of shrimp shell and other diseases in serious cases. 6. The water contains organotin or organophosphorus insecticides, which inhibit the synthesis of chitin in shrimp carapace. 7. Improper use of medicine or sudden change of water quality caused stress, abnormal shelling occurred, and it was difficult for shrimp to return to normal state in a short time. Second, the prevention and treatment of soft shrimp shell will often be infected with disease and outbreak. In addition, when collecting shrimp, soft-shell shrimp is easy to die out of water, resulting in a decline in the survival rate of transportation. Therefore, the proportion of soft-shell shrimp should be reduced as much as possible in the process of culture. Main methods: 1. Maintain good water quality and bottom quality, and create a good culture environment. 2. The ratio of calcium to phosphorus in water should be strictly controlled, and the PH value should be controlled between 7.8 and 8.6 to prevent ammonia nitrogen and nitrite nitrogen from exceeding the standard. 3. The preventive effect can be prevented by feeding chitin 2 ‰ ~ 3 ‰, high stable vitamin C2 ‰ ~ 3 ‰ and Gantai 2 ‰ 3 times a week. 4. If shrimp disease occurs, 10 ‰ fixed chitin, 210 ‰ high stable vitamin C210 ‰, 8 ‰ Gantai, and other antibiotics such as Keshuangwang 10 ‰, or norfloxacin 7 ‰, etc., are fed continuously for 3 to 5 days. 5. If the amount of chitosan is increased before the shrimp is released, not only the proportion of soft shell shrimp can be reduced, but also the shrimp shell can be thickened and the shrimp shell will not be easily damaged. The dosage of solid shell is 10 ‰ ~ 12 ‰, and the multi-dimensional 10 ‰ is used together and fed continuously for 5 days. 6. Conditionally, chitin can be fed for a long time, which can promote growth and prevent disease. -Haida should be good. I heard that domestic aquatic materials have the highest scientific and technological content.