The greenhouse can be a permanent steel-concrete structure or a simple plastic greenhouse. Greenhouses generally 0.5-3 acres is appropriate, the pool depth of 1.5 meters. One-fifth of the water in the shed should be isolated from the breeding water surface as a reservoir. Intensive shrimp cultivation in the shed should be equipped with an inflator that can inflate oxygen in the cultivation pool. The greenhouse should have enough fresh water sources, underground drinking water, and a reservoir to store and aerate the well water “heatingâ€. Wen Peng should be equipped with air holes and doors and windows in order to facilitate the adjustment of temperature.
First, the preparation before laying seedlings to Qingchi disinfection. Second, according to the water supply and salinity of the seedlings, advance the water intake. If the shed is desalinated, store fresh water in the pool. Third, we must cultivate basic food. After impounding, according to the degree of nutrition of the water body, moderate fertilizer can be applied. Generally, urea and superphosphate are applied in a ratio of 10:1 or 10:2, and human urine can also be fermented. If the water is clear, diatoms can also be inoculated. Through staged fertilization, the water color is yellowish green or light brown, and the transparency is 0.3-0.4m. If there is a clump-like food organism breeding better. Or rotifer or Artemia eggs may be cast before seedlings to facilitate the proliferation of food organisms. Fourth, we must monitor the water temperature and regulate water quality. The water temperature should be above 26°C, which is similar to the water temperature for the nursery units. The salinity should be similar to or slightly lower than that of the water supply unit for the cultivation unit. The pH should be within the pH 8.00.3 range. If it is higher than 8.6, it can be replaced with water or organic weak acid (acetic acid) to adjust, such as less than 7.5 splash lime water adjustment.
Second, the choice of shrimp and shrimp larvae to choose: the desalination of Penaeus vannamei shrimp should be selected more than 3 days of age, body length 0.6cm or more, robust and tidy, no disease and attachments. For shrimps that have been desalinated, healthy shrimps should be selected for a length of 1 cm or more and the time is less than 10 days. Transportation and delivery: Generally use thermal insulation foam box, there are non-toxic plastic bags, add water, put seedlings, charge pure oxygen, seal and transport. When the seedlings are released, the greenhouse water should first be gradually filled to the inside of the bag and then cast. Seedling density: According to the requirements of seedlings and greenhouse conditions, the effective water surface of the shed can reach 1 million to 2 million mu when it is seeded. The seedling density is low, and it can emerge when the seedling length is 2.5-3cm; the density is high. The seedlings should emerge at 2.0-2.5cm to avoid a decrease in survival rate.
Third, desalination of shrimp seedlings desalination shrimp should be started after 3 days of delivery of prawn, reduce the salinity at a rate of 2 æ¯å¤© per day, as far as possible to gradually dilute, in order to facilitate the gradual adaptation and formation of shrimp osmotic pressure adjustment ability, improve desalination The survival rate of the process. After one week, the desalination rate can be increased appropriately. In the desalination process, the water temperature should be in the range of 26 °C -32 °C, the best water temperature is 28 °C ~ 30 °C, and strive to change the water temperature is small. In addition, the pH should be stable, generally within the range of 8.0-8.3, which is also the key to reduce discomfort (stress response) and increase the survival rate of shrimp seedlings during desalination.
Fourth, shrimp cultivation management First, feed the bait.
Generally, the daily feed amount of fresh fish can be fed around 40% of the total body weight of the shrimp seedlings, and then the feed intake, stomach fullness, and residual bait are determined to increase or decrease the feeding amount. The bait includes rotifers, brine shrimp, washed fresh fish, freshwater fish and artificial diets. Generally, it is fed 6 times a day, once every 4 hours, and it is the most in the evening.
The second is monitoring and regulation of water quality. Water depth: 0.7m to 1m in the early stage and 1.5m in the later stage. Water temperature: 28 °C ~ 30 °C is the best, the minimum is not less than 26 °C, the highest is not higher than 32 °C. Water color: Yellow green, light brown or yellow brown is preferred. Transparency: 30cm ~ 40cm is better. pH: 8.00.3 best. Dissolved oxygen: 0.5 to 0.7 mg is good, if necessary, oxygenation agent. Ammonia nitrogen: below 0.5 mg/L, zeolite powder can be used when it is high.
V. Precautions Keeping water quality, good and stable substrate, and cutting off the source of the disease, the cleanliness of the feed and the rich nutrition are fundamental to the prevention of fish diseases. Since the incubation time of the greenhouse is relatively short and the density is high, the following points should also be noted.
The first is the use of sodium EDTA in the early stage to prevent heavy metal poisoning or malformation of shrimp.
The second is the application of photosynthetic bacteria in the shed, which can decompose the bottom organic matter in time.
The third is that the food is cleaned on the basis of home allicin and Vc and other drugs to prevent viruses and germs and improve the disease resistance of shrimp.
First, the preparation before laying seedlings to Qingchi disinfection. Second, according to the water supply and salinity of the seedlings, advance the water intake. If the shed is desalinated, store fresh water in the pool. Third, we must cultivate basic food. After impounding, according to the degree of nutrition of the water body, moderate fertilizer can be applied. Generally, urea and superphosphate are applied in a ratio of 10:1 or 10:2, and human urine can also be fermented. If the water is clear, diatoms can also be inoculated. Through staged fertilization, the water color is yellowish green or light brown, and the transparency is 0.3-0.4m. If there is a clump-like food organism breeding better. Or rotifer or Artemia eggs may be cast before seedlings to facilitate the proliferation of food organisms. Fourth, we must monitor the water temperature and regulate water quality. The water temperature should be above 26°C, which is similar to the water temperature for the nursery units. The salinity should be similar to or slightly lower than that of the water supply unit for the cultivation unit. The pH should be within the pH 8.00.3 range. If it is higher than 8.6, it can be replaced with water or organic weak acid (acetic acid) to adjust, such as less than 7.5 splash lime water adjustment.
Second, the choice of shrimp and shrimp larvae to choose: the desalination of Penaeus vannamei shrimp should be selected more than 3 days of age, body length 0.6cm or more, robust and tidy, no disease and attachments. For shrimps that have been desalinated, healthy shrimps should be selected for a length of 1 cm or more and the time is less than 10 days. Transportation and delivery: Generally use thermal insulation foam box, there are non-toxic plastic bags, add water, put seedlings, charge pure oxygen, seal and transport. When the seedlings are released, the greenhouse water should first be gradually filled to the inside of the bag and then cast. Seedling density: According to the requirements of seedlings and greenhouse conditions, the effective water surface of the shed can reach 1 million to 2 million mu when it is seeded. The seedling density is low, and it can emerge when the seedling length is 2.5-3cm; the density is high. The seedlings should emerge at 2.0-2.5cm to avoid a decrease in survival rate.
Third, desalination of shrimp seedlings desalination shrimp should be started after 3 days of delivery of prawn, reduce the salinity at a rate of 2 æ¯å¤© per day, as far as possible to gradually dilute, in order to facilitate the gradual adaptation and formation of shrimp osmotic pressure adjustment ability, improve desalination The survival rate of the process. After one week, the desalination rate can be increased appropriately. In the desalination process, the water temperature should be in the range of 26 °C -32 °C, the best water temperature is 28 °C ~ 30 °C, and strive to change the water temperature is small. In addition, the pH should be stable, generally within the range of 8.0-8.3, which is also the key to reduce discomfort (stress response) and increase the survival rate of shrimp seedlings during desalination.
Fourth, shrimp cultivation management First, feed the bait.
Generally, the daily feed amount of fresh fish can be fed around 40% of the total body weight of the shrimp seedlings, and then the feed intake, stomach fullness, and residual bait are determined to increase or decrease the feeding amount. The bait includes rotifers, brine shrimp, washed fresh fish, freshwater fish and artificial diets. Generally, it is fed 6 times a day, once every 4 hours, and it is the most in the evening.
The second is monitoring and regulation of water quality. Water depth: 0.7m to 1m in the early stage and 1.5m in the later stage. Water temperature: 28 °C ~ 30 °C is the best, the minimum is not less than 26 °C, the highest is not higher than 32 °C. Water color: Yellow green, light brown or yellow brown is preferred. Transparency: 30cm ~ 40cm is better. pH: 8.00.3 best. Dissolved oxygen: 0.5 to 0.7 mg is good, if necessary, oxygenation agent. Ammonia nitrogen: below 0.5 mg/L, zeolite powder can be used when it is high.
V. Precautions Keeping water quality, good and stable substrate, and cutting off the source of the disease, the cleanliness of the feed and the rich nutrition are fundamental to the prevention of fish diseases. Since the incubation time of the greenhouse is relatively short and the density is high, the following points should also be noted.
The first is the use of sodium EDTA in the early stage to prevent heavy metal poisoning or malformation of shrimp.
The second is the application of photosynthetic bacteria in the shed, which can decompose the bottom organic matter in time.
The third is that the food is cleaned on the basis of home allicin and Vc and other drugs to prevent viruses and germs and improve the disease resistance of shrimp.
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