First, pond clear pond is very necessary, the use of insecticide clear pond effect is good, shrimp disease less, the survival rate is high. If you disinfect with bleach, and then use insecticide to clear the pond, the effect will be better. When bleaching powder is applied, the bottom of the pool is kept at a depth of 30 cm, the medicine is melted in the boat cabin, and then one person row or push the boat forward, and the other one is splashed. The amount of bleaching powder is very large. Put the medicine in advance on the dam of the pond. Whenever a part of the bleaching powder is spilled, the medicine can be taken to the dam nearby. This saves time and manpower. The effective insecticide is liquid, and the bottom of the tank is reserved for water depth of 20 cm. The medicine can be uniformly sprayed into the pond according to the concentration requirements. After 10 days of treatment, the pond was flushed with water three times and the average water depth reached 1 meter. 60 mesh filter screens are installed at the inlet to prevent wild fish, crabs and crabs from entering, otherwise 80% of the shrimp will be eaten by fish. The average water depth of the pond must reach 1 meter and maintain a certain depth of water. In addition to the necessary living space for the shrimp seedlings, it can also ensure that the water body has a strong self-purification capability. In water temperature Second, plankton in the pond should be used to cultivate copepods as a dominant species, copepods are a good food for shrimp, in general, more Copepods, often shows that the better the water quality, shrimp grow more healthy The higher the survival rate of seedlings. Third, China's shrimp breeding multiplication seedlings to raise the seedling density to 80,000 / mu is appropriate, seedling body length 1.0 cm. With low density, the utilization efficiency of ponds cannot be fully utilized; if the density is too large, the amount of plankton in ponds will drastically decrease. On the one hand, the biological feed of shrimps will be reduced. On the other hand, the ability of the plankton to regulate water quality will be reduced, and the water quality will be unstable. Increased sexual activity, such as residual bait, feces and other metabolites of shrimp increased, increase the amount of bacteria in the pond, resulting in reduced survival rate of shrimp seedlings, and even large-scale disease later; In addition, the density is too large, the shrimp out of the specification is small, after the release of the outside world Poor environmental capacity is weak. In practice, seedlings with a seeding rate of 5000 kilograms per kilogram (5 kilograms per mu) will be able to regulate water quality. The reason is that indole feeds on phytoplankton, which reduces the biomass of phytoplankton, resulting in a reduction in zooplankton biomass; in addition, earthworms have a direct effect on small zooplankton, resulting in a decrease in zooplankton biomass. At the same time, the pond plankton with a broadcast density of 5 kg/mu was uniformly stable. At this time, the intensity of the filter and feed was moderate, the promotion and suppression of plankton were balanced, the composition of plankton was normal, and the change was stable. The role of regulating water quality was better. In order to stabilize the water environment, the survival rate of shrimp seedlings is high. What needs to be explained is that the above mentioned broadcast refers to the seeding of the seedlings rather than the large-size seedlings. The large-size fishponds cannot be mixed with the raised shrimps. The reason is that the large-sized variegated pheasants (having been cultivated for 2 years) will filter phytoplankton in large quantities, which will worsen the dietary conditions of copepods, and the death of copepods due to the direct filter-feeding of cockroaches. Copepoda It is an excellent biological feed for shrimps. Another reason is that all ponds that can be used every year can't use insecticide ponds, because the use of insecticide clear ponds will also kill crickets. Therefore, there is no clear pond that will lay the hidden dangers for the temporary raising of shrimp larvae, even if there is no disease. The survival rate is also low. Fourth, put the seedlings on June 25 or so, put the seedlings later in time as well as possible, to avoid the disease epidemic, try to put seedlings at the same time as normal shrimp, it is easy to encounter diseases, so the time to lay seedlings and normal shrimp The time is staggered. The time to put into the sea on June 25, the entire holding time is controlled at 30 days. V. It has been found in practice that ponds that use insecticide clearing ponds have low planktonic biomass and are relatively lean in water quality. Therefore, after using pesticides to clean ponds, it is necessary to use fertilization in combination with feeding to raise shrimps. Can not be fed metamorphic feed, feeding the average amount of 0.05 kg / ten thousand / day can be, feeding too much amount of smelly pond easily, do not feed on rainy days. After the seedlings are released, the mixed fertilizer (chicken manure and chemical fertilizer) must be used before the stocking of shrimps. Generally, the chicken manure starts to apply 17 kg/mu, ammonium bicarbonate 6.4 kg/mu, and diammonium phosphate 1.6 kg/mu. During the cultivation process, the amount of chicken manure was 8 kg/mu/time, top dressing 1 time; ammonium bicarbonate 1.1 kg/mu/time, diammonium phosphate 0.4 kg/mu/time, top dressing 3 times. The change in plankton abundance over time is mainly determined by the supply of nutrients and the feeding of farmed animals in ponds. In the early stage of raising, the feeding level of pupae and shrimp seedlings is low, so the abundance of plankton will be maintained at a relatively high level. However, as the food intake of praying mantis and shrimps gradually increases, the nutrient in the pool water does not increase significantly. This causes The abundance of plankton declines in the later period, so the amount of fertilization in the middle and later stages should be adjusted in time with the abundance of plankton. The timing of pond topdressing in the holding process is based on a transparency of no more than 40 cm. It is a dangerous period after rain, and the water quality changes significantly. Plankton basically disappears, and top dressing must be strengthened. It should be noted that the pond with organic fertilizer is turbid, but the zooplankton has large biomass and long-term fertilizer effects. The organic fertilizer contains all nutrients and contains certain active organic substances (such as vitamins), which can promote the mass production of phytoplankton; After 2 days, the water color obviously increased, but after 1 week, the transparency increased, the fertilizer effect was fast but the effect was not long-lasting, and the chemical fertilizer generally had the deficiency of C element and was easily adsorbed by the sediment. The utilization rate was low and the waste of fertilizer was serious. Mixed fertilizer is best, and the organic fertilizer and fertilizer defects are compensated in the mixed fertilizer. It is feasible to use organic fertilizers throughout the course, but it is important to pay attention to the number of times. 6. The quality of shrimps is the key to the success of holdings. The number of seedlings should be sufficient and the specifications should be neat. Note that even in the same nursery, the quality of the seedlings in each nursery pond is not the same. It is also practicable to purchase no-litter hatchlings or seedlings from outside the country and cultivate them in the local nursery pond for several days to 1 cm, and then enter the shrimp ponds for temporary raising. During the transportation of shrimps and shrimps, 70 cm 40 cm plastic bags are transported with oxygen. The seedling density cannot exceed 25,000 bags/bag, 1/3 water, and 2/3 oxygen. Each bag of seedlings should be uniform, loading should be secure, take a flat road, avoid bumps. In addition, the water quality of ponds is ageing, and the salinity is too high. It is not feasible to release the seedlings because the pollution of the waters in the open sea is intensifying. The so-called “water wax†in the past cannot guarantee safety. The local density of the shrimp when it was first introduced into the pond was very large, and the density was reduced after a few days. The reason was that the shrimp gradually spread out and no longer piled up. In general, a 1.0 cm shrimp seedling has a cracking phenomenon within 10 days, and the specification is about 1.5 cm. At first, shrimps prefer to inhabit areas with high temperature in shallow water. When the temperature rises and water temperature is higher than 28°C, shrimp seedlings prefer to move to deepwater areas. On rainy days or moonlit nights, shrimp seedlings do not like activities. The shrimp grows too quickly and then the growth rate suddenly slows down. At the same time, a large number of shrimp grow in the pond, which is often a precursor to the disease. Seven shrimp body length 1 cm, body length Eighth, after entering the water in early June, 5cm, the phenomenon of white shrimp death appears to be normal, because the white shrimp is sensitive to spawning and has poor resistance. In the first half of June, white shrimps with a body length of about 0.6 cm will appear in the shrimp ponds. Occasionally, the white shrimps in the ponds have spawned and hatched, which is also normal. 9. The holding process of shrimp seedlings is a short-term process. The purpose it pursues is to obtain large-sized shrimp seedlings with a size of 2.5 cm or more in a short period of time. Therefore, the above experience is only aimed at the stocking of multiplication shrimp seedlings, instead of ordinary ones. There is a difference between Chinese shrimp farming, common shrimp farming, and breeding of shrimp seedlings on technical operations.
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