In the middle and lower reaches of the Yangtze River, ponds are generally cultured in the middle and early May. This is because the early water temperature is low and is easily affected by cold air. At the beginning of April, the outdoor water temperature is less than 15°C. Directly under the pool cultivation. The use of simple plastic greenhouses for pre-intensive breeding of Macrobrachium rosenbergii seedlings will have a significant effect on improving the unit production of Macrobrachium rosenbergii and the commercial listing of shrimps in advance. I. Construction of nursery pools for temporary nursery in plastic sheds The use of simple plastic greenhouses to maintain seedlings, after 25 days - 30 days of cultivation, the size of the larvae of the genus Macrobrachium larvae will reach a height of 3 cm or more, thus lowering the body length. The increased adaptability of the water temperature effect has increased the survival rate of development. At the same time, the seedlings were put into large ponds and cultured about 25 days in advance, which also laid a solid foundation for the breeding of the second quail. 1. Construction of nursery ponds in plastic greenhouses Seedling nursery ponds can be reconstructed with smaller area. The area is 300 square meters - 600 square meters. The shape is rectangular, and the water inlet and drainage system is complete. The bottom of the pool is flat and toward the drain outlet. There is a certain inclination to facilitate the release of water and the seedlings, water depth 1.0m - 1.2m. Greenhouses can be constructed from materials such as bamboo or steel pipes and covered with plastic film. 2. The supporting facilities for plastic greenhouses are based on the size of nursery ponds for oxygenation. Generally, one 0.75kW aerator or one 1.0kW-1.5kW Roche blower is installed on 300 square meters. If the air pump is used, the gas head is set to be uniform. The gas head needs to be fixed with a rope or bamboo rod so that the gas head is kept about 10 cm from the bottom of the pool. The boiler can use 0.2t--0.3t coal-fired or oil-fired boilers. 3. The preparatory work before stocking is generally conducted at the end of March-early April, and the second seedling time is scheduled to be carried out in late June. Two months before the seedling time, the clear pond disinfection of nursery ponds is conducted. Disinfectant is quicklime or bleaching powder. Dry disinfecting method is adopted. Quicklime is used 150kg/mu or bleaching powder 30kg/mu. The whole pool is splashed evenly after dipping water in the utensil. After 5 days, the pool water was drained, then the water was poured in 50cm--60cm, and the water was filtered with a 60 mesh-80 mesh sieve. 4. Fertilizer and warming nursery pond immediately after the water, in order to facilitate the rapid propagation of plankton in the water body, so that the shrimp into the pond after the intake of fresh live bait. Fertilizer is mostly fertilized with inorganic fertilizer, and the dosage is nitrogen 2g/cubic meter-4g/cubic meter, phosphorus 0.3g/cubic meter-0.4g/cubic meter. If the water quality is thinner, the fertilizer amount can be increased appropriately, keeping the transparency of the water In 25cm--30cm, the water color is greenish blue. Three days before the seedlings, water was injected into the seedling nursery to make the depth of the pool water reach 1.0m, and began to warm up, requiring the pool water to maintain between 20°C and -22°C through the heated water temperature. 5. Stocking density seedlings should be selected to be healthy, disease-free, no injury, specifications in body length 0.7cm - 0.8cm, the individual size is consistent, and fully diluted after the shrimp seedlings, stocking density of 1,500 / square meter - 2000 / square meter. Macrobrachium rosenbergii has the habit of killing each other and inhabiting the environment. It requires the establishment of branches, bamboo shoots and other inhabitants in the nursery pond to provide a good environment for the shrimps to inhabit, hide, avoid damage, and make shells. 2. Breeding of seedlings in a nursery pond After the shrimps are fed into the pond, they can be fed with surimi, egg yolk, fish meal, etc. in the early stage. After being prepared into a paste, they are uniformly sprayed along the edge of the pool. The daily feeding amount is 10% - 15% of the body weight of shrimps; after 5 days Can be fed with artificial compound feed for juvenile shrimp (initially used crushing material, then changed to granular material), and the daily feeding amount is 8% - 10% of the body weight of the shrimp seedlings; afterwards, the feeding quantity is gradually adjusted along with the growth of the shrimp body. 1.5 hours after feeding, check the bait situation. Feeded 4 times a day, the amount of feed in the morning and at noon accounted for 30% of the daily feed. 2. The water temperature and water quality regulation should control the water temperature of the nursery pool in the shed so that the temperature difference is too large to cause adverse growth of the shrimp seedlings. At the same time, due to the high density of the shrimp seedlings in the nursery ponds, it is necessary to strengthen the patrol ponds and timely change the water according to the water quality and the water conditions. Continuously open the aerator or air pump to ensure the dissolved oxygen in the water is above 5mg/L. 3. Daily management feeding feeds should adhere to the principle of “Four Sets†and do not regularly add 5‰-10‰ vitamin C to the feed. The specific method of operation is: after breaking up with eggs, add vitamin C, dissolve, and then add water to dilute. , and then spray on the feed. Use beneficial microorganisms (such as photosynthetic bacteria) on a regular basis to facilitate the improvement of water quality. At the same time, we must do a good job of prevention and treatment of shrimp seedlings, 10 days -15 days with the bromine fungicide 0.2ppm Quanchiposa. Third, shrimp farming 1. Pond condition area is generally 2 mu - 10 mu, water depth is 1.2m - 1.5m, the shape of the pool is rectangular, and requires long time of light, the sediment is of muddy sand structure, the bottom of the pond is flat and has a certain direction towards the outlet. The slope is convenient for draining pool water and catching shrimp, and the pond inlet and drainage system is perfect to facilitate the exchange of water bodies in the pond. Water requirements for aquaculture are non-pollution, transparency is greater than 40cm, pH is 7.2--8.5, dissolved oxygen is above 4mg/L. At the same time, each shrimp pond is equipped with one 0.75 kW--1.5 kW aerator per area. The pond drained the pool water in March and was cleared thoroughly with clear lime or bleach in about April. 2. Cultivating the water in the aquaculture pond is filtered with 80-mesh nylon sieve or polyethylene mesh, and the water is inoculated with 70cm--80cm of water to cultivate water. Newly built ponds are lean, with organic fertilizers such as chicken manure and cow dung used as base fertilizers. After fermentation, the amount is 100 kg/mu. Aged ponds have a certain degree of fatness and can be applied to whole ponds with inorganic fertilizers. Nitrogen fertilizers The dosage is 1.5kg/mu - 2.0kg/mu, plus phosphate fertilizer 200g/mu - 300g/mu. Fill the pool water 5 days before planting. 3. In early May, the temperature of the shrimp seedlings gradually recovered. When the water temperature in the culture ponds is basically stable above 20°C, the shrimp hatching and stocking work in the nursery ponds are selected to be sunny. At this time, the seedlings grown in nursery ponds were 2.5 cm to 3.0 cm in length, and the stocking density was 25,000 tails/mu - 30 000 tails/acre. Requirements pool water pH value between 7.5--8.5, transparency 25cm--40cm. 4. After feeding and managing the shrimp into the pond, due to the water quality in the early stage, the zooplankton in the water body is abundant, providing prawns with fresh live bait; later at the same time feeding high-quality full-price pelleted feed, the feeding rate is based on the body weight of the shrimp Calculated from 5% to 7%, with the growth of shrimp seedlings, the feeding rate will be appropriately lowered, depending on the weather, water quality, shrimp activity, etc., and the degree of feeding of shrimp seedlings should be controlled at 70%. Feeding 3 times a day, there may be no simple feed table in the breeding pond to check the food intake and growth of the shrimp. Every 15 days - 20 days Quanchiposa 1 quick lime, the amount of 20kg / acre - 30kg / acre, adjust the water quality; with the increase in the pool shrimp density and feeding, should be based on water color, water quality, food intake, etc. Water exchange is performed in a timely manner. The amount of water exchanged per time is 20% to 30% of the total amount of water in the pool. In the case of high density, 0.2ppm dibromohydanthin was regularly sprayed on the whole pond and sprayed on the feed with garlic heads at intervals of 15 days to 20 days. The added amount was 3%-10% of the total amount of feed. Continuous use of 3 days to prevent disease. 5. Harvesting of the first batch of Macrobrachium rosenbergii can be started in late July. Large nets are used for fishing nets, so that small size shrimps can be drilled out of the mesh and caught in cages. Inside, and quickly picking, large listings and small stay-in pools. After each pool is harvested, the second larval shrimp seedlings raised in plastic sheds are then captured and refilled according to the conditions of each pool. After the replenishment, they are disinfected once with drugs to ensure that no disease occurs. IV. Technical Summary 1. The technical requirements for the breeding of Macrobrachium rosenbergii require a scientific and reasonable schedule for the two groups of seedlings in the plastic greenhouse, the cultivation of the pond, and the timing of shrimp catching and feeding, especially in the plastic greenhouse. High density, difficult to control water quality, time will affect the growth and survival rate of seedlings, cultivation time should generally not exceed 1 month. 2. Temporary rearing in plastic greenhouses should pay attention to changes in water temperature, dissolved oxygen, and pH values, conduct appropriate exchanges of water bodies in a timely manner, and regularly apply quicklime and beneficial microorganisms to improve the aquaculture environment. 3. During the shrimp farming period, the transparency of the pool water is maintained at 25cm--40cm, and the water quality can be adjusted with the "tea saponin" Quanchiposa. "Tea saponin" has a fertilizer effect, but also to promote the role of shrimp shell clams, the dosage of 2g / cubic meter - 3g / cubic meter. During the high temperature period, the vitamin content in the feed is severely lost. Add complex vitamins to the feed in a timely manner and add 2 phr of feed to enhance the body's immune function and constitution. In addition, fresh live baits such as snails and squid can be fed appropriately to increase the plumpness and bright color of the shrimp. 4. The operation of the wheel catcher should be based on the weather, water temperature, water quality, etc. The arrest time should be between 3am and 7am. Before harvesting, it is necessary to stop for 1 day so as to avoid the death of Macrobrachium sinensis which is full of oxygen deficiency. After the shrimps are caught in the box, they must have aeration facilities and inject new water into the pool so that the pool water will maintain a high dissolved oxygen level and be quickly and lightly operated during the selection process of catching small fish to make the shrimp more convenient. Body is not damaged. 5. Insist on a daily tour of the pond to observe the feeding, growth and activity of the shrimp body, and reasonably arrange the amount of feeding, and change the water according to the water color and water quality conditions. Open the aerator 8 hours a day -10 hours a day, so that the evening hours, early morning boot time, boot time at noon short, in case of hot weather, thunderstorms and other bad weather may be appropriate to extend the boot time, in order to improve production.
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