The feed cost accounts for about 70% of the cost of the culture of white shrimp in South America. Therefore, reducing the feed cost and rationally saving the feed in the culture are important ways to obtain better benefits for the culture of Penaeus vannamei.
The feedstuffs were selected from the special feeds produced by the regular manufacturers of Penaeus vannamei. Do not use other shrimp feeds instead. The early culture should pay attention to fertilization and cultivate biological communities that are beneficial to shrimp growth, such as benthic organisms and plankton. Transfer some beneficial feed organisms to the pool to reduce feeding. With the consumption of basic bait, some clean and fresh live bait and special feed for juvenile shrimp can be fed, and then gradually transition to feed for white prawns.
Maintain water quality P. vannamei enjoys fresh water quality. The water quality is good. The shrimp grows rapidly and has few diseases. It can make full use of the bait and reduce the bait coefficient. The water quality is yellow-green, with a transparency of 30 cm to 40 cm, and dissolved oxygen of 4 mg/l. The commonly used methods of water quality regulation are: Change the water frequently, generally change the water from 7 days to 10 days 1 time, each time changing 10% to 20%; regularly splash lime, every 10 days to 15 days 1, the concentration of 15 mg / Kilograms; the use of biological agents, such as photosynthetic bacteria, Bacillus, etc. to regulate water quality; installation of aerators.
Clear wild fish in the wild pond, mixed shrimp will compete with South American white shrimp for food, and even eat white shrimp, so it should be removed. The method of clearing is to inject water 20 to 30 centimeters before the seedlings are planted, and then use the calcined pulp to splash the whole pond and thoroughly disinfect the pond. The dosage is 150 kg per 1/15 ha. Filter mesh bags when entering the water to prevent wild fish from entering the pool with water.
The bait technique is a small number of times. According to the shrimp's eating habits and growth characteristics, we must adhere to the principle of small number of times. The amount of bait is different at different times. Generally, 30% of the feed is given at 7 o'clock, 10% at 11 o'clock, 40% at 18 o'clock, and 20% at 23 o'clock. The second is to grasp the appropriate amount of feeding. The amount of bait is more difficult to grasp, too much will result in 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, set a few 1 square meters around the pool around the bait station, evenly spread when feeding, feed the shrimp after 1.5 hours to 2 hours to check the feeding situation. The third is feeding according to the weather conditions. The weather is clear, and when the wind and warm days are fed, the weather is not good, the rain is overcast, and the weather is hot or cold when it comes to feeding or not feeding. The fourth is to feed according to shrimp conditions. According to the growth of shrimp and related diseases, the amount of feeding is flexible. Prawn grows vigorously and is fed properly when there is no disease, but it is fed less when it is fed. When shrimp is fed in large quantities, it is fed less, and the clam shell is fed more than once a day.