The practice of artificial proliferation resources of shrimp showed that shrimps with a length of about 1 cm of discharge fluid had a low survival rate, and the rate of catching was only about 3%; while shrimps with a fluid length of more than 3 cm were high, the survival rate was high. The rate can be as high as 8-10%. Therefore, it is important to obtain a relatively high proliferation of resources for shrimps of 0.7-1 cm in length cultivated in shrimp farms after being raised and raised to 3 cm or more in length. Measures. In order to ensure a high survival rate for the temporarily raised standard crude shrimp seedlings, the following technical links should be grasped: (1) Selection of shrimp ponds: In order to facilitate the discharge of work and avoid damage to the shrimp seedling The location of the shrimp ponds should be selected to be closest to the sea along the open sea area. Open the drainage gates at high tide to drain all the water (including water in the ditch); each pond inlet and drain gate should be set separately; the water depth in the pond should be set separately. For 1.5-2 meters, the ideal size of each pond is 5-6 mu and the maximum is not more than 10 mu. It is convenient for feeding and sampling to test the survival rate of survival. The road to the shrimp ponds should be smooth and can pass through small motor vehicles. For easy transportation. (2) Treatment of shrimp ponds: before the seedlings are blown, the shrimp ponds must be drained first, the aged sludge should be removed and exposed to sunlight for 10-15 days. The cracks at the bottom of the pond should be used as the standard; , Kill pathogens, improve shrimp pond water quality environment, prevent shrimp disease. The use of clear pond drugs are: lime, tea cake, bleach, ammonia and so on. At present, the use of quick lime is more because of: 1 Quick lime forms strong alkali with water and generates high temperature during emulsification, which can basically kill most of the microorganisms and parasites that damage shrimp in the shrimp pond; Increasing the alkalinity and hardness of water in shrimp ponds and changing the acidic water quality produced by humus are beneficial to the growth of shrimps and not conducive to the growth of pathogens. 3 Lime calcification not only increases the concentration of calcium ions in water, but also enables the sludge to absorb and fix it. The release of nutrients can increase the water's fatness. Generally, 100 kg of lime are used per mu of shrimp ponds. (3) Basic bait cultivation: After the shrimp ponds are filled with water as required, chicken manure and horse dung are applied in the ponds to cultivate monocystic algae. Under normal climatic conditions, the water in the pond becomes dark brown in 3-5 days. The yellow color shows that the monocytic algae have grown in large numbers. It is best to inoculate rotifers. After another 3-5 days, the shrimp seedlings can be put in place, and the basic bait can be used to cultivate good shrimp ponds. It is not possible to feed baits after 10-15 days after seedling emergence. If the basic bait is not cultivated well, then on the third day after the seedling is cast, soy milk and fishmeal will be fed. After 10 days, fresh quail meat, minced fish, etc. should be fed (it can be used with artificial mixes). Feeding once a day in the evening, the amount of feed is fed at 5-15% of the total body weight of the shrimp in the pond. (4) Water quality requirements for shrimp ponds: The pH of the pond water should be kept at 7.5-8.5, the transparency should be about 60 cm, and the ammonia nitrogen content should be controlled at 0.6-1.6-1 mg/l. The optimum water temperature for shrimp and long-haired shrimps is between 18-32°C, and the optimum salinity is 20-30‰. The optimum water temperature for shrimp is 20-30°C, and the optimum salinity is 10-20‰. According to the requirements of three shrimps on temperature and salinity, when shrimp shrimps are introduced into shrimp ponds, special attention should be paid to the variation of water temperature between the nursery pond and the temporarily raised standard shrimp pond, when the shrimp pond water temperature is lower than the shrimp When the required temperature limit is lower, do not cast seedlings into the shrimp pond. When the nursery pond salinity is higher than the standard coarse shrimp pond, it is necessary to add fresh water for desalination. When the salinity variation is less than 5, the shrimp ponds can be seeded and the standard crude shrimp pond water should be changed every day. 3 or so to keep the water fresh. (5) Number of shrimps to be put in and the time for temporary standard raising: In normal circumstances, 120,000 to 150,000 shrimps with a body length of 0.7 to 1 centimeter are put into the standard shrimp pond per acre (too little waste of water, too much influence If the weather conditions are normal, the custody measures are appropriate, and the animals will be raised for 30 days. The average body length can reach more than 3 cm and the survival rate can reach 60-70%. If the above five technical processes are well-controlled, an ideal shrimp with a standard of conservation can be obtained. With experience, gates can be opened and used to flush into the sea with large tides, which are usually repeated several times.
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