1 Clear the wild fish, reduce the number of wild fish and miscellaneous shrimps in the pool of contenders, compete for feed with white shrimp, and even eat white prawn. If low-quality fish and shrimp compete for feed, it will reduce the feed utilization rate. Pay attention to its removal, the method is to advance the water 20-30 cm seedlings, lime per acre with 150 kg of pulp after the Quanchiposa completely clear pond disinfection, kill the pool wild cattle fish. Add filter bags when entering the water to prevent wild fish from entering the pool with water. 2 Pay attention to the selection and supplement of feeds. 2.1 To select the special feed for white shrimp of South America that is produced by regular manufacturers, the feed formula is reasonable, which can ensure that the shrimp grow quickly and avoid the waste of feed. Do not use other shrimp substitutes. 2.2 Before the cultivation, pay attention to fertilization and cultivate biological communities that are conducive to shrimp growth, such as benthic organisms and plankton. In addition, some beneficial food organisms can be transplanted into the pond so that less or no feeding can be done. With the consumption of the basic food, some pathogen-free live bait and shrimp special compound feeds can be fed, and then gradually transition to investment. Feed the white prawns feed specifically to save part of the feed. 2.3 After the outbreak period of shrimps, feeding fresh live feeds will not cause a large number of shrimp diseases after the outbreak of shrimp disease. Therefore, fresh live feeds can be fed according to local feed sources to save the cost of bait. But pay attention to the feed must be fresh, not spoilage. 3 Maintain fresh water quality The first step is to raise water, and the quality of the water will affect the body color, growth speed and bait factor of the shrimp. Penaeus vannamei enjoys fresh water quality, good water quality, rapid growth of shrimp, less disease, and can make full use of bait, reducing the feed coefficient, so the culture of white shrimp should be adjusted to maintain water quality. General requirements of water is yellow-green, transparency 30-40 cm, dissolved oxygen 4 mg / liter or better. The commonly used methods of water quality regulation are: 1 Change the water frequently, —— change the water once every 7-10 days, change 10%-20% each time; 2 regularly splash lime, once every 10-15 days, the concentration is 15g / M3; 3 installed aerator, adjusted with aerator. 4 Use biological agents, such as photosynthetic bacteria, to regulate water quality. 4 to master the feeding techniques 4.1 a small number of times: according to the shrimp's feeding habits and growth characteristics, adhere to the principle of a small number of times, and different time feeding amount is not the same, generally 70% of the daily feeding amount of 30% , 10% at 11:00, 40% at 18:00, and 20% at 23:00. 4.2 Grasp the appropriate amount of feeding: The amount of bait is more difficult to grasp, causing too much feed wastage, too little shrimp is not enough to eat, is not conducive to growth. A more practical and feasible method is to set up a bait station, and set several 1.0-meter-meter bait stations around the pool. Evenly throw it along the pool when feeding, and inspect the shrimp for feeding after 1.5-2 hours of feeding. Under normal circumstances, if the stomach rate is 60%-70%, the feeding is reasonable. If the stomachicity rate is too high, the feeding amount will be reduced. If the filling rate is too low, the feeding amount will be increased. 4.3 Feeding according to the weather conditions: The weather is clear, and the wind and warm days are fed; the weather is not good, the rain is overcast, and when the weather is hot or cold, there is little or no feeding. 4.4 Feeding according to shrimps: According to the growth of shrimps and the availability of diseases, the amount of feeds can be controlled flexibly. Shrimp grows vigorously and is fed properly when there is no disease, but it is fed less when it is not. Shrimp is fed less when it is shelled, and it is fed after one day. 4.5 Feed according to water temperature: Feed less when the water temperature is lower than 18°C ​​or higher than 32°C, and feed more when it is 25-30°C. 4.6 Feeding according to the water quality: Fresh water is fresh, and if the dissolved oxygen is sufficient, the shrimp will eat well and can be fed normally. If the water quality is poor, when the dissolved oxygen is low, the shrimp will be fed less or not.
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