There are many wild fish and miscellaneous shrimps in the pond. They compete with South American white shrimp for bait, and even eat white shrimp. Low-quality fish and shrimp compete for feed, which will reduce the feed utilization rate. Therefore, they should be taken care of by removing them. Water 20-30 centimeters, with 150 kg of lime slurry per acre, Quanchiposa completely clear pond disinfection, kill the pool cattle wild fish. Add filter bags when entering the water to prevent wild fish from entering the pool with water.
2, pay attention to the choice of feed and supplement
2.1 To select the special feed for Penaeus vannamei 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 Pay attention to fertilization in the early stage of cultivation and cultivate biological communities that are beneficial 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, keep the water fresh
Shrimp first raises water, and the quality of the water affects the body color, the speed of growth, and the feed coefficient 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 spill lime, once every 10-15 days, with a concentration of 15 g/m3;
3 Install aerator, adjust with aerator.
4 Use biological agents, such as photosynthetic bacteria, to regulate water quality.
4, 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 multiple times, and the amount of feed at different times is not the same, generally 30% of the feeding amount at 7:00, 11:00 vote 10%, 40% voted 18:00, 20% voted 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 pond. Evenly throw it along the pond when feeding, and inspect the shrimps for feeding after 1.5-2 hours. 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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