Technical communication

Factory raised shrimp, your feeding method is right?

In the factory farming process of white shrimp, some farmers seem to be very busy, feeding shrimp four or five times a day, but no matter whether the shrimp is full or not, people are very tired, but the economic benefits of shrimp are not high, why on the ground?

Possibility 1: underfeeding, overfeeding at one time

Shrimp in a short time can not eat, the remaining nutrients (water-soluble vitamins, minerals, amino acids, etc.) will be dissolved in the water, reduced nutrition, bad water quality, will also lead to feeding can not be added, and even cause dead shrimp; After the release of the attractant, the attractiveness of the leftovers became worse and the prawns did not like feeding. Left-over protein content is high, staying in water for a long time, it is easy to attach bacteria, shrimp after feeding easy to infect digestive tract diseases.

Possibility two: feeding interval is long, feeding quantity is insufficient

The feeding interval is more than 5 hours, and the shrimp is quickly eaten within 30 minutes each time. Most of the shrimp are not full, resulting in long-term insufficient feeding, uneven shrimp size, easy to produce nutritional deficiency disease, weak physical fitness, poor anti-emergency, anti-vibrio, virus ability, and easy to get sick.

Possibility 3: Too many feedings, not enough

Easily cause shrimp empty stomach after feeding on feces, dead algae, foam, bacteria and other biological flocs, appetite for a long time in the excited state, so that the body energy consumption is too much, growth is slow, even malnutrition, water quality is not easy to disease.

So how to choose the right way to feed?

Slow shrimp feeding is relative, not enough to eat is absolute, factory shrimp feeding should be more meals + right amount. The alimentary canal of shrimps is relatively short, and the excretion is fast. The food that can be accommodated in the alimentary canal of shrimps is limited, so it is beneficial for the digestion and absorption of feed to be given appropriately in several times. Multi-meal system can adjust the next feeding amount in time in a short time, avoid overfeeding or underfeeding, and reduce the waste of feed. Appropriate feeding is beneficial to improve the constitution and growth rate of shrimps.

It is recommended to feed 4 to 6 times a day. The time can be 6:00, 10:00, 14:00, 18:00, 21:00 and 24:00.

Determine the right amount of bait

The quantity of bait in shrimp pond is related to the food intake of shrimp, and the food intake of prawns is related to the body length, development stage, water environment conditions and health status of prawns. High dissolved oxygen, high water temperature, large amount of water change and low ammonia nitrogen will increase food intake. Generally according to the following circumstances to determine the number of bait.

1. The quantity of prawns in the pond should be estimated more accurately;

2. According to the estimated number and average body length of prawns, the theoretical number of prawn baits can be calculated by referring to the prawn baits casting scale.

3. After feeding, the amount of bait should be adjusted according to the actual food intake, gastrointestinal plumpness and the color of gastrointestinal feces. If the bait is quickly eaten within 40 minutes after feeding, the intestines and feces of the front row are black, the amount of bait should be appropriately increased; If there is still more bait in the pool before the next bait casting, the bait should be appropriately reduced or suspended.

Factory raised shrimp feed check is based on bottom check or sewage check, the feed intake of the feed table has a great relationship with the position of the feed table, the structure of the feed table, the material of the feed table and the feeding amount of the feed table; It is very important to observe the feed table, but can not fully believe the feed table, completely rely on the feed table to adjust feeding, it is very likely to cause insufficient feed and feed waste serious, resulting in the outbreak of shrimp disease.

4, according to the full degree of prawn stomach adjustment is the most scientific. Bait casting interval is 4 hours/time. After 1 hour, there is no material left at the bottom of the pool. If more than 2/3 of the prawns reach full stomach and half stomach, the color of gastrointestinal feed indicates sufficient bait casting. If the full stomach and half stomach of prawns are less than 1/2 of the total, it indicates that the amount of bait is insufficient, and the amount of bait should be increased appropriately.

5. When the water temperature is 27-28 ℃, the daily growth rate of the body length of the standard shrimp is 1.2-1.7mm, the average daily growth rate of the juvenile shrimp is 1.2-1.5mm, the average daily growth rate of the medium shrimp is 1.0-1.3mm, and the daily growth rate of the large shrimp is about 1mm. Failure to reach the above growth rate and problems with water quality, shrimp health and enterosporidia may be caused by insufficient bait casting or poor feed quality. In addition to the seedling genetic problems, the size of shrimp growth is not uniform, mostly due to the lack of bait.

6, the water temperature is more than 32℃ in the high temperature period, less water change, should be relatively reduced the amount of bait; If the water temperature is lower than 28℃, the feeding amount should be reduced. Generally, the feeding amount will be reduced by 10% if the water temperature is 1℃ lower than the last feeding water temperature, and the feeding amount will be increased by 10% if the water temperature is 1℃ higher.

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