A, facilities construction

Mainly breeding ponds, solar greenhouse greenhouse and compressed inflatable pipe. Ponds are generally selected north-south, neatly arranged, with an area of 3 to 5 acres, length and width of 2:1, depth of 1.8 to 2.0 meters, with a perfect intake and drainage system. On the north side of the pond, within the repair of a small pond, a small pond width of about 8 meters, long that is the width of the pond, the depth of the pond to maintain 1 meter. Big pond ridge above the unified pull a steel rope, with wooden stakes spaced on top, as a small pond set up plastic greenhouse ridge, ridge and small pond between the ridge, according to the need to pull a steel rope in the middle again. Through the ridge support to pull a layer of mesh, mesh covered with a layer of white plastic film, film and then a layer of mesh. The mesh and film are hung to the ridge on either side of the small pond and fixed with wooden stakes. The two ends of the shed are sealed with film to ensure that the shed is insulated. After the shed is erected, PV pipes with a diameter of 2 centimeters are set side by side at intervals of 1.5 meters at the bottom of the small pond. The pipe is perforated, and the pipe is connected to a compression pump, which is used to increase oxygen to the shrimp pond.

Second, shrimp fry stocking

In northern Zhejiang, facilities should be completed before mid-March. Before the end of the month to clear the pond, cultivate good water quality. Pond clearing available lime or bleaching powder, 1 week into the water, organic fertilizer and biological agents, so that the pond water is stable yellow-green or tea brown. In April, when the outside temperature rises above 20 ℃, the water temperature in the shed is basically maintained at about 20 ℃, you can release seedlings. It should be noted that the release of seedlings, the water temperature in the shed and the nursery water temperature difference must not exceed 2 ℃, otherwise it will seriously affect the healthy growth of seedlings. Stocked shrimp seedlings require neat specifications, shrimp body appendages complete, body surface clean, body segments long and thin, tentacles together, tail fan stretching fully, gastrointestinal tract straight and full, the heart contraction is strong, strong ability to go against the water, the size of 1 cm or so. According to the large pond area mu put 35,000 tails, put enough shrimp seedlings.

Third, greenhouse management

1, greenhouse insulation: April, daytime temperatures are usually between 20 ℃ to 30 ℃, but due to the large temperature difference between day and night, the temperature at night will still be relatively low, the natural water temperature is generally only about 15 ℃, and once the air temperature changes significantly, the water temperature changes will be very large, which is when the South American white shrimp is usually not able to farm without thermal insulation facilities. Scaffolding sealed without ventilation, after absorbing heat, the shed temperature in most of the day than outside the shed can be higher than 5 ℃ or so, the water temperature can be raised relatively 3 ℃ to 5 ℃. Therefore, the role of the shed is not only thermal insulation, but also play a role in raising the water temperature. In general, the shed should be sealed, especially continuous cloudy days or low temperatures, the shed temperature drops, but as long as the shed is sealed, can still ensure that the water temperature is not less than 20 ℃; when the outside world maximum temperature for several days close to or even more than 30 ℃, the shed water temperature will be significantly higher, this time in order to maintain a relatively stable temperature in the shed, before and after noon should be lifted up the shed, so that the shed aeration to reduce the temperature to keep the water temperature below 25 ℃. Water temperature below 25℃. Sealed shed, poor air circulation, high humidity, so normal time every day at noon should lift the shed, so that the air is exchanged to improve the quality of air in the shed.

2, feeding: mainly feeding high-quality artificial feed, according to the shrimp intake and growth to determine the daily feeding. Feeding four times a day, feeding time for the morning, noon, evening, night. Evening a feeding for the daily feeding 2/5, the other each feeding 1/5 of the daily feeding. generally set up in the pool observation network, specific observation of shrimp feeding. Early shrimp shelling time is short, more feeding before and after shelling.

3, water quality regulation: early shrimp on the water requirements are higher, not only requires the water body to provide a fresh, stable environment, but also requires to provide an abundance of natural bait. Therefore, shrimp seedlings in the pond before the use of organic fertilizers to fertilize the water, at the same time, the use of photosynthetic bacteria and other biological agents, so that the pond water to maintain the fat, live, tender, cool. Once the shrimp pond is fed feed for a long time, sometimes the water quality will be over-fertilized, so, generally every 7 days to use photosynthesis bacteria, interspersed with the use of bacillus spores and so on. It is required to do less or no medication. At the same time, we must insist on 24 hours non-stop aerated oxygenation, which can ensure that there is sufficient dissolved oxygen in the water, but also play a role in regulating water quality.

Fourth, adult shrimp farming

Into May, the midday temperature has risen to more than 25 ℃, the natural water temperature is also close to or over 20 ℃, after a month of breeding in the shed, the prawns in the greenhouse can generally grow to 6 cm or so, when the meteorological forecasts of the temperature continues to stabilize unchanged, the shed should be timely dispersal of seedling to the large pond in the breeding. Dispersal before the pond to take the same measures to disinfect, fertilization, at the same time, the shed should be aeration and ventilation in advance, so that the water temperature in the shed gradually close to the water temperature in the pond. When all these conditions are ripe, dismantle the shed, peel back the embankment of the small pond, and let the shrimp fry automatically disperse into the large pond. The greenhouse insulation breeding work is over, and transferred to the normal pond adult shrimp culture stage. The process and technical requirements of adult shrimp culture is the same as the general culture of South American white shrimp. After nearly two months of breeding, to July, South American white shrimp can grow to about 100 tails / kg, at this time, can be marketed one after another. Its raising time than natural farming can be more than one month in advance.