How to save feed costs for Penaeus vannamei
First, remove wild fish and reduce the number of contenders
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. 20-30 cm of water, 150 kg per acre with lime slurry after the whole pool spilled completely clear pond disinfection, kill the pool of wild fish. Add filter bags when entering the water to prevent wild fish from entering the pool with water.
Second, pay attention to the choice of feed and supplement
1, to select the regular manufacturers of South American white shrimp feed, feed formula is reasonable, can ensure rapid growth of shrimp, avoid feed waste.
2. In the early stage of cultivation, pay attention to fertilization and cultivate biological communities that are beneficial to shrimp growth, such as benthic organisms and plankton. Some beneficial food organisms can be transplanted into the pond so that less or no bait can be given. With the consumption of basic bait, some fresh pathogen-free live baits and special compound feeds for juvenile shrimps can be fed, and then gradually transition to feeding special feeds for P. vannamei, which can save some of the feed.
3. In the later period of culture, after the outbreak of shrimp disease, the feeding of fresh feed will not cause a large number of shrimp diseases. 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.
Third, 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. It is generally required that the water be yellow-green, with a transparency of 30-40 cm, and dissolved oxygen of 4 mg/l or more.
The commonly used methods of water quality regulation include: 1. Changing the water level frequently, generally changing the water once every 7-10 days, each time changing 10%-20%; 2. Laying lime regularly, once every 10-15 days, the concentration is 15g/cubic m; 3, install aerator, adjust with aerator. 4. Use biological agents, such as photosynthetic bacteria, to regulate water quality.
Fourth, master the feeding techniques
1, small amount of multiple times: according to the shrimp's feeding habits and growth characteristics, to adhere to the principle of a small number of times, and different time feeding amount is not the same, generally 70% of the feeding amount of 30%, 11:00 Vote for 10%, vote for 40% at 18:00 and 20% at 23:00.
2, to 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-square-meter bait stations around the pool. Spread evenly along the pool when feeding and check the shrimp feeding condition after feeding for 1.5-2 hours. Under normal circumstances, Stomach rate of 60% -70%, then the feeding is reasonable, high stomach rate is to reduce the amount of feeding, if it is too low will increase the amount of feeding.
3, according to the weather conditions feeding: the weather is fine, the wind and warm day and more feed; bad weather, rainy weather, when the weather is hot or cold, less feed or not feed.
4, according to the shrimp feed: According to the growth of shrimp and whether there is no disease to control the amount of feed. 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.
5, according to the water temperature feeding: When the water temperature is lower than 18 °C or higher than 32 °C, feed less, 25-30 °C when fed more.
6, according to the water quality of feeding: fresh water, dissolved oxygen is sufficient when the shrimp intake Wang, can be fed normally; and poor water quality, low dissolved oxygen is less or no feed.
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