CATDOLL : CATDOLL: China's Vannamei shrimp production in 2021

1. China’s Vannamei shrimp production in 2021

According to relevant data, in 2021, the farming area of ​​Chinese white shrimp reached more than 30,000 mu, the output reached more than 10,000 tons, and the output value reached more than 400 million yuan.

2. What are the construction, breeding effects and breeding techniques of Penaeus vannamei in the north?

The geothermal well is 317.34m deep, with an outlet temperature of 98℃ and a total water storage capacity of 5 million tons. In autumn and winter, we use 10 fish breeding ponds to intensively culture white shrimp, and achieve the winter listing of adult white shrimp in northern Taiwan. The per-acre yield is 990kg of commercial shrimp with a body length of 12cm-14cm. The test results are introduced as follows:

1. Construction of breeding facilities

In autumn, after catching tilapia fingerlings, drain the pond water, use a mud pump to remove the sludge at the bottom of the pond, then use 100kg/mu of quicklime to spray and disinfect the entire pond, inject new water, and drain the pond water again after 1 week. Each culture pond has an area of ​​about 1.0 mu, and one air stone is hoisted for every 20, and the pond is added with a geothermal circulation pipeline. The entire breeding pond is equipped with two 15kW Roots blowers and a generator.

2. Preparation before planting

1. Cultivation of basic bait: Inject unpolluted fresh water filtered by 100-mesh silk screen into the biological cultivation pool, with the water inlet 40cm-50cm, and fertilize to cultivate unicellular algae. The nitrogen-phosphorus ratio of the fertilizer is 2-3:1. After 7-10 days of cultivation, the pool water clarity is 25cm-30cm, and the water color is brown or light green.

2. Treatment of pond water salinity: 4-5 days before stocking, use seawater salt to adjust the salinity of the pond water to within the range of 0.5‰-1.0‰.

3. Selection and stocking of seedlings

1. Selection of seedlings: High-quality desalinated seedlings should be selected, and seedling desalination should be carried out in the nursery room. During the shrimp larvae period, the salinity of the pond water should be reduced by no more than 4 units per day. During the desalination process, the salinity of the pond water is reduced to 1.018→1.014→1.010→1.006→1.003→1.001. Desalination should not be too rapid, especially before emergence, otherwise the seedlings will die when released into the breeding pond. The more fully the seedlings are desalinated and the larger the individuals, the higher the breeding survival rate. Shrimp seedlings with no dirt on the surface, specifications of 100,000/kg-120,000/kg, and flexible jumping are temporarily kept in the net cages of the breeding pond. The 24-hour mortality rate is not more than 2%.

2. The time for stocking seedlings in the geothermal greenhouse is the end of September. The water temperature when stocking seedlings is controlled at around 20℃, which is equivalent to the temperature in the nursery room.

3. Stocking density is 40,000 to 60,000 fish per mu.

4. Breeding management

1. Water quality control During the breeding process, the water temperature is maintained between 25℃-28℃ by geothermal circulation pipes, the pH value is about 7-8, the water color is brown and slightly green, the water transparency is 30cm-40cm, and fresh water is added to the water depth of 2.5m-3.Om. In the later stage of breeding, water is changed frequently to keep the water clean. The opening of the aerator depends on the growth of the cultured shrimp, and the micro-lactic acid bacteria water agent is sprayed regularly to control the reproduction of bacteria and protozoa. In the later stage of breeding, some medicated bait should be fed in time.

2. Feeding In the early stage of breeding, the feeding is mainly based on basic bait organisms. Because the local rotifer resources are rich, some rotifers can be appropriately inoculated as the early bait of white shrimp after the peak of basic bait organism reproduction, and fed with shrimp and feed twice a day. The feeding amount should be adjusted at any time according to the size, quantity, weather, feed quality and other conditions of the shrimp. In the middle stage of breeding, the daily feeding amount is 6%-8% of the shrimp body weight, and it is fed 3 times a day. In the late stage of breeding, the daily feeding amount is 4%-5% of the shrimp body weight, and it is fed 4 times a day. The feeding method is to spread evenly along the edge of the pond. Several feed trays can be set up in each pond. After feeding for 1 hour, lift the tray for inspection, and comprehensively formulate the next feeding amount based on the satiety rate of the shrimp.

3. Daily management: Patrol the pool twice a day, especially at night when someone must be on duty. Pay attention to maintaining the water temperature and air volume to prevent wind from damaging the plastic greenhouse.

5. Harvest

After 110 days of careful breeding, the yield of whiteleg shrimp per mu is 990kg, the market price is 11 yuan/kg, and the input-output ratio is about 1:2.

The breeding greenhouse is mainly built with steel wire, wooden stakes or concrete pillars, and transparent film. The price of one acre of land for my greenhouse is between 2000 and 3000 yuan, and it starts to be built around October every year (Fujian).

As the saying goes, if you don’t raise winter shrimp, you can’t say you’re raising shrimp. Winter shrimp are expensive, and the benefits are several times higher than those of ordinary shrimp ponds, and the effect is obvious.

3. Do you know the roughing scheme for earthen ponds for whiteleg shrimp in northern China?

What is earth pond roughing and its advantages

The p5 or p10 seedlings from the nursery or roughing farm are managed intensively for a period of time and then released into the breeding pond after they grow to about three or four centimeters. The number of seedlings is high and the breeding success rate is high.

condition

Take 6-9 mu of land and drive ground stakes around it to prevent damage from strong winds and rainstorms. Put on plastic film. If the weather is cold, you can use 0.6mm film, and if the weather is mild, you can use 0.4mm film. The main support can be steel structure, wooden stakes or cement, depending on the environment. Dissolved oxygen: The fan with a power of no less than 4 watts per square meter can supply oxygen. There are two common modes: one is nano-disc bottom oxygen, 15-20 cm from the ground; the other is an impeller aerator. Drainage and germination: The principle is similar to the drainage system of the high-level pool or the seedling drainage system of the nursery pool, and the pipes are connected to drain water and germination.

Stocking density

Generally speaking, 300,000 p10 seedlings are placed in 6-8 mu of land. The current model in the north is as follows: Assuming that the outer pond has a total of 10 mu, 40,000 seedlings are planned to be placed per mu, a total of 400,000 are needed. 500,000 are placed in a pond covered with a shed (taking into account the survival rate), and the seedlings are divided after marking.

Roughing process

Before stocking, disinfect with chlorine dioxide (10 jin per mu) or bleaching powder (5 jin per mu), and then detoxify with sodium thiosulfate 12 hours later. 6 hours after detoxification, EM Water King (1 bottle for 3 mu) + Haiyi Peicao Paste (1 bucket for 5 mu) + Bacillus subtilis (1 pack for 4 mu) to fertilize and adjust the water. After the water color improves, prepare to stock the seedlings. 4 hours before stocking, Vibrio Killer (1 pack for 2 mu) + Vc Stressor (1 pack for 4 mu) to control Vibrio and improve the stress resistance of shrimp seedlings. After the seedlings are put in, spray Vibrio Killer (1 pack for 2 mu) every 3 days, and EM Water King + Bacillus subtilis every 4 days. Spray high calcium quick supplement (1 pack for 3 mu) + Pulse 100 (1 pack for 5 mu) every 2 days to supplement the nutrients necessary for shrimp to shed and promote shed shells. If you feed shrimp chips, add nutrient (10g per pound of shrimp chips) + active lactic acid bacteria (2g per pound of shrimp chips) + enzymatic immune polysaccharide (5g per pound of shrimp chips) after rubbing the shrimp chips. If you feed multiple meals a day, you can mix them separately and feed them. If you feed live bait, such as Artemia, Artemia, etc., you must mix Vibrio killer (10g per pound of live bait) and stir evenly. When the shrimp enters the first liver transition period after about 20 days of growth, mix the feed and take liver protection (5g per pound of feed).

Soak in boiling water and cool, then mix with the feed. During the thickening process, pay attention to algae, water color changes and weather changes. If there are changes, use detoxification green water treasure (1 bottle for 4 acres) + Vc stress spirit (1 pack for 4 acres). Thicken to 3-4 cm, and separate the ponds after the seedlings emerge.

After a period of centralized management, the fish will be discharged into the breeding pond. At this time, we must pay attention to controlling the density.

When raising fish, it is generally necessary to prepare the breeding pond in advance, pay attention to the temperature, and install relevant facilities and equipment to better ensure life.

The p5 or p10 seedlings from the nursery or roughing farm are managed intensively for a period of time and then released into the breeding pond after they grow to about 3 or 4 centimeters. Advantages: high number of seedlings and high breeding success rate.