How much is the price of white prawns per jin? What are the key points of feeding and management?

Penaeus vannamei has the characteristics of strong ability to adapt to the environment, fast growth rate, less disease, high yield, large individual, excellent disease resistance and so on. In recent years, the market demand for it has gradually increased. How much is the price of South White prawns per jin? What are the key points of feeding and management?

How much is the price of Penaeus vannamei per jin?

In May, the average price of 35 heads / jin of Penaeus vannamei in Zhanjiang, Guangdong Province was 22 yuan / jin, which decreased by 15.4% compared with the previous month. The average price of 35 heads / jin in Guangdong Pearl River Delta was 22 yuan / jin, which decreased by 21.4%, and the average price of 40 heads / jin decreased by about 19.2%. The average price of 35 head / jin specifications in Guangxi is 26 yuan / jin, which is about 7.1% lower than the previous month. The average price of 40 heads / jin is 22 yuan / jin, which is about 8.3% lower than the previous month.

Despite the recent rebound in shrimp prices in China, some industry insiders said that there may still be an oversupply of white shrimp in the world this year. At present, except Thailand and China, other major producing areas are actively increasing the production of white shrimp in 2019. Among them, the pattern of increasing production of Indian shrimp in the first half of this year is likely to occur, which can even be described as crazy expansion. However, due to the impact of trade frictions between China and the United States in 2018, the downward pressure on the domestic economy has increased, and the growth rate of consumption has slowed down. Some people in the industry expect that the consumption of imported white shrimp in the Chinese market may not increase significantly in the first half of 2019. And white shrimp stocks that arrive in the Chinese market after the Spring Festival also take time to digest. At the same time, China's shrimp production is also expected to recover.

Second, what are the main points of feeding and management of Penaeus vannamei?

1. How to control the shrimp seedlings well: some shrimp farmers only consider the price, do not consider or pay no attention to the quality of the shrimp seedlings, knowing that the quality is poor, they only think that the survival rate of the seedlings is low, and it is impossible to estimate the number of survival ponds, so it is not easy to raise them successfully.

2. When purchasing seedlings, it is best to choose virus-free, large size, average body length more than 1 cm, strong vitality, strong shape, too complete shape, no deformity, full of food in the stomach and intestines, and can quickly pull over against the current when swimming and stir water. Strong bounce, no parasites and attached dirt in vitro is better. Penaeus vannamei is in the process of desalination (salinity should not exceed 1/1000 per day).

3. The view of the density of frightened seedlings per mu: when throwing shrimp seedlings, we must follow the water depth of the pond and the quantity of livestock water according to the local water source. Under normal circumstances, the water depth is 25-300000 tails / mu at a depth of 12Mui 14m. 15Mel 16 meters deep 35-400000 tails: 17Mel 18 meters in 45-550000 tails; shrimp ponds above 19 meters, no more than 80, 000 fish per mu, to calculate the area and the number of seedlings, put into the same batch of shrimp fry, one full release.

4. Raise scare and raise water first: fertilize good water before putting into the seedling, so that there is sufficient bait after the shrimp seedling is put into the pond. Because young shrimp are mainly plankton that feed on water. In the process of fertilizer and water, organic fertilizer can be combined with some inorganic fertilizers (chemical fertilizers) or some special fertilizer for aquatic products can be combined with photosynthetic bacteria, so that the ammonia produced in the process of fertilizer and water can be absorbed effectively. In order to prevent the deterioration of water quality, the ammonia in the water without photosynthetic bacteria will increase, which will affect the antibacterial ability and survival rate of shrimp seedlings. When the plankton in the pond water of the young shrimp is 2mi 4 cm long, the feeding demand of the shrimp can not be satisfied at all, so the nutrients must be supplemented, and the high efficient nutrients of LAPP, fish and shrimp Zhuangyuan, multivitamins and immune polysaccharides must be added to the feed to improve the immunity of the shrimp and lay a good foundation for success.

5. Scientific feeding: healthy breeding must have high-efficient and high-quality ingredients, choose a good feed, and feed reasonably. Make the shrimp eat well without causing waste. If more feed will damage the water quality and bottom quality, directly affect the healthy growth of shrimp, but also increase the culture cost, too little shrimp growth cycle is long, but also increase the risk of culture, even if the daily dosage is accurate, the proportion of feeding time per meal throughout the day should be reasonable in order to make shrimp grow healthily, reduce culture cost and reduce feed coefficient. The feeding amount of Penaeus vannamei is relatively large, and the high pool water temperature at 23 degrees Celsius-32 degrees Celsius is generally divided into 4 Mel for 5 times based on the principle of less and more meals. The amount of bait used in the evening accounts for 70% of the whole day, and it accounts for 20% in the daytime. The specific feeding time is 18-19:00: 35%, 23: 15%, 04:30 25%, 10:30 15%, around 14:30. Two net traps of about 0.8 square meters should be set up every 5 mu to check the eating of shrimp. When feeding, the bait in the net fish accounts for about 1% of the total feed in the net fish. Check that the feeding time of shrimp in the net should be determined according to the different growth stages of shrimp, and the length of shrimp is before 8 cm. Since it is about 45 days, the feeding time is controlled at about 02:30, the shrimp body length is 9 cm in the middle and late growth stages, and the feeding time is controlled from 1 to 01:30. If the feeding time is long, it is reducing the diet, and if the feeding time is short, it is necessary to add food.

6. improvement of sediment: the improvement of water environment and sediment should be done in the middle and later stage of Penaeus vannamei culture. As a result of high-density feeding bait food also increased. Organic matter such as residual bait and excreta of aquatic animals are deposited and decomposed by bacteria, consuming a large amount of dissolved oxygen and producing a large amount of ammonia oxygen and nitroso ammonia hydrogen sulfide, which should reduce the eutrophication of water body and inhibit the growth of pathogenic bacteria and harmful algae. In order to achieve the natural ecological balance of the aquaculture water body, it is necessary to start with the reduction of material control, about 70% of the usual feed quantity, and timely increase sewage discharge, strengthen influent and drainage, or regularly use bottom improvement drugs. The commonly used drugs are: zeolite powder (non-medicine), live water element (non-medicine), West Africa benefit, photosynthetic bacteria, EM and other products can be used, so that the sediment at the bottom of the pond can be fully oxidized and decomposed, when the pool water returns to normal. Then gradually add the material to the normal level.