Now some South American white prawn farmers think that feeding the feed is a simple matter. Just throw the feed into the pond in time. In fact, the South American white prawn feed is very particular, and scientific and reasonable feeding can not only save. Feed can also prevent the occurrence of diseases.
First, clear wild fish
There are many wild fish and miscellaneous shrimps in the pool. They will compete with South American white prawn for bait, and even eat white prawn. Low-quality fish and shrimp will compete for feed, which will reduce feed utilization. Therefore, it should be removed by the method. The water is 20~30cm, and the mud is sprayed with 150kg of quicklime per acre. The whole pond is splashed and thoroughly cleaned and disinfected to kill the wild fish in the pool. Add a filter bag when entering the water to prevent wild fish from entering the pool with water.
Second, the correct choice of
1. It is necessary to select the special feed for South American white prawn produced by regular manufacturers. The feed formula is reasonable, which can ensure the rapid growth of shrimp and avoid the waste of feed. Do not use other shrimp materials instead.
2. Pay attention to fertilization in the early stage of breeding, and cultivate biomes that are beneficial to the growth of shrimp, such as benthic organisms and plankton. And can transplant some beneficial bait organisms into the pool, so that less or no bait can be fed. With the consumption of the basic bait, some fresh bait without pathogens and special compound feed for juveniles can be fed, and then gradually transition to investment. Feeding special feed for white shrimp in South America, which saves some of the feed.
3. In the late stage of breeding, the high incidence period of shrimp disease has passed. Feeding fresh live feed has not caused a large number of shrimp diseases, and some fresh bait can be fed according to the local feed source to save the cost of bait. But be careful that the feed must be fresh and not spoiled.
Third, keep the water fresh
Shrimp raise water first, and the quality of the water affects the body color, growth speed and bait coefficient of the shrimp. P. vannamei enjoys fresh water quality, good water quality, rapid growth of shrimp, and few diseases. It can make full use of bait and reduce the feed coefficient. Therefore, the cultivation of P. vannamei should pay attention to regulating water quality and keeping water quality fresh. Generally, the water is yellow-green, the transparency is 30~40 cm, and the dissolved oxygen is 4 mg/L or more.
Fourth, master the feeding skills
1. A small number of times: according to the feeding habits and growth characteristics of the shrimp, it is necessary to adhere to the principle of a small number of times, and the feeding amount is different at different times, generally 30% of the daily feeding amount at 7:00, 11:00 10% vote, 40% at 18:00, 20% at 23:00. Generally, the farmers vote twice a day, once in the morning and evening, and the effect is not as good as a small number of times.
2. Master the appropriate feeding amount: the amount of feeding is more difficult to master, too much to cause feed waste, too little shrimp is not enough to eat, is not conducive to growth. A more practical method is to set up a bait table, set up several bait tables along the pool, evenly sprinkle along the pool when feeding, and check the feeding condition of the shrimp after feeding for 2 hours. Under normal circumstances, if the stomach rate is 60%~ 70%, the feeding is reasonable, the high stomach rate will reduce the feeding amount, and the low level will increase the feeding amount.
3. Feed according to the weather conditions: the weather is fine, the wind and the day are warmer; the weather is not good, the rain is continuous, and the weather is hot or the cold current is less or not.
4. Feed according to the shrimp situation: According to the growth of the shrimp and the presence or absence of disease, the amount of feeding can be flexibly controlled. Shrimp grows vigorously. When there is no disease, it should be fed more properly. Otherwise, it should be fed less. When the shrimp is boiled in a large amount, it will be fed less.
5. Feed according to water temperature: less water when the water temperature is lower than 18 °C or higher than 32 °C, and more when the temperature is 25~30 °C.
6. Feed according to the water quality: the water quality is fresh, when the dissolved oxygen is sufficient, the shrimp can be fed normally, and the water can be fed normally; while the water quality is poor, when the dissolved oxygen is low, the feed is less or not.
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