How to raise Penaeus vannamei?

1, pond structure. Most ponds are 10-20 mu in size, with a long "back" shape, the deepest water level can reach 2 meters, and the flat middle part is often less than 1 meter. The soil is very sticky and contains a certain amount of salt. River water is mostly used as water source, with salt content below two thousandths, hardness above 200 and little pollution. The initial average water level was 60cm, and then increased to1.2m.

2. release the seedlings. Generally, the sowing time is from the end of April to the beginning of June. Most of the seedlings are ordinary soil seedlings, 50-90 yuan/10,000 plants, and the sowing density is10-1.20,000/mu. Seedling testing is mostly carried out in seedling farm, and water quality testing is less. After half a month, the seedlings were taken out for observation. If the survival rate is low, replant it, ranging from 30 thousand to 60 thousand per mu.

Step 3 feed. No need or less feeding after seedling release, 0.2-0.3 kg/(mu. Day) feeding after one month. At first, one meal a day, the feeding amount increased day by day, and after one week, it was changed to two meals a day. Seeding for about 50 days, feeding 2-3kg/(mu. Day), reached a peak in the high temperature period in July, about 12 kg/ (mu. Days), and then reduce the feed according to the situation.

4. Water quality management. Organic acids were used to detoxify seedlings before they were released, and after they were released, they liked fertilizer and water, and gradually accepted the use of soluble organic fertilizers, and Bacillus, lactic acid bacteria and EM complex bacteria were used more. There are few water quality tests, only paying attention to the later nitrite index. I like yellow-green water and hate blue-green water. Once I found out, I used a lot of copper sulfate or cyanobacteria decomposition essence to kill algae.

5. The aerator has been equipped. The aerobic capacity of most ponds is low, usually 0.6kW/ mu. Take 10 mu pond as an example. Generally, there are 4 1.5kW impeller aerators, and some ponds are equipped with 1 push wave aerators. Air pumps and water wheel aerators are rarely used.

6. The low quality of fry and high stocking density increase the cost of fry and are difficult to manage, which affects the growth speed and specifications of shrimp. It is suggested to cultivate the first generation of brand seedlings, reasonably reduce the stocking density to 350,000-400,000/mu, and delete shrimps before "Tang Ding" to reduce the risk.

7. Feed early. It is suggested that opening material should be fed after the seedlings are released, so as to ensure the nutrition supply at seedling stage, give full play to the growth characteristics of seedlings, and appropriately add some feed additives to promote digestion, such as Bacillus subtilis, etc., so as to reduce feed coefficient, reduce feed waste, and delay the deterioration of bottom materials.

8. Slow down the aging speed of water quality, use soluble organic fertilizer, adjust water quality with microbial agents, use less or no compound fertilizer, and resolutely use no farmyard manure. The water quality is seriously aging at high temperature, which greatly reduces the solubility of oxygen, and zooplankton will also aggravate the consumption of oxygen. Therefore, it is necessary to set up a reservoir, change more water, optimize the algae structure, ensure the supply of dissolved oxygen for prawns, and slow down poaching.

9. The aerobic capacity is weak, which is seriously inconsistent with the stocking density, so the problem of enteritis and white manure in the high temperature period is serious. It is suggested that the aerobic capacity should be improved while reducing the culture density, and the aerobic capacity should be 1.0kW/ mu. When conditions permit, we should optimize aerobic configuration and match multiple aerators to improve aerobic efficiency.

10, early shrimp, shortening the culture cycle. In the later stage, the water environment and sediment deteriorated seriously, and a large amount of organic matter accumulated, which was not conducive to shrimp culture. It is suggested to reduce the density of fry, feed reasonably, shorten the breeding cycle and release shrimp early.