Feed is the material basis for the growth of shrimp, and it is also one of the main inputs for shrimp farming. It must be based on the feeding characteristics of shrimp to achieve reasonable feeding. The so-called rational feeding is based on the physiological needs of different growth stages of shrimp and the state of life at the time of the precise feeding.
(a) Determination of the daily feeding amount.
1. Regularly estimate shrimp survival in shrimp ponds.
It is difficult to accurately and reliably estimate the survival of shrimp in shrimp ponds. Because the distribution of shrimps in the pool is not very uniform, the clusters are always swimming around, so there is no best method for accurate estimation. The estimation of shrimp survival in shrimp ponds is generally experienced. Shrimp personnel were assessed using visual inspection, frame measurements, trawl assays, and spin-net measurements.
2. Calculate actual daily bait.
Based on the estimated number of shrimp tails and the average body length, the actual daily feeding amount was calculated by referring to the shrimp feeding amount table, but adjustments should be made at any time according to actual conditions.
3. Adjust the amount of newspapers.
1 Adjust according to feeding speed. 1.5 hours after feeding, more than 70% of the shrimp reached half of the stomach or satiety, and shrimp did not have group feeding for feeding, indicating proper amount of feeding. The feeds were quickly eaten and the shrimp ponds were still in large numbers. When the empty stomach and residual stomach were more than 30%, the feeding was insufficient. Conversely, if there is a surplus of feed, it means that the feeding is excessive and should be reduced appropriately.
2 Adjust according to growth conditions. In general, the average daily shrimp increase 0.13-0.16cm in the early stage of shrimp rearing, 0.08-0.10cm in the middle period, and 0.06-0.08cm in the later period. If the above criteria are not met and the shrimp body and water environment have no problem, the growth may be slow due to lack of feeding, and the amount of feeding should be increased.
3 Adjust according to environmental conditions. Actual feeding should be adjusted according to the weather, temperature, water quality, pesticide application, etc., and less investment should the environmental conditions be poor.
(b) feeding method.
1. Feeding position. According to the shape of the shrimp pond, set the feeding area or feeding belt to avoid feeding the whole pond. Eli shrimp habitat activity.
2. Feeding times and times. According to the season, weather and shrimp body size flexibility. Generally, after the seedlings are placed in the post-seedling stage, feeding 4 times per day is appropriate. The time is 6 o'clock, 10 o'clock, 18 o'clock, and 2 o'clock. Each feeding amount accounts for 30%, 10%, and 40% of the feeding amount. , 20%; juvenile shrimp, shrimp into the stage, daily feeding 3 times is appropriate, time is 5, 19, 23, each feeding amount accounts for 40%, 45%, 15% of the daily feeding amount. . It is not advisable to feed during the hot weather from 10 a.m. to 6 p.m. The best feeding time is generally after sunset and before sunrise, ie 19 o'clock and 6 o'clock.
3. The principle of feeding. Should be hard-working, less investment, more investment in the evening, early morning; reduce or even stop feeding when a large number of hides, and increase the feeding after one day; when the wind and warm weather, sunny days, more cast; good water quality, slow growth, no disease More time to vote; more food in the pond when there are more food-eating creatures; spoilage and poor feed quality; vote when the water temperature exceeds 32 degrees; cast water when the water quality is not good; do not vote when heavy storms come; don't vote when the disease occurs. Pay attention to weather changes during feeding, such as rainy days, poor water quality, especially in high temperature period, the amount of feed should be controlled, and efforts should be made to reduce residual feed in order to prevent pollution at the bottom of the pool and prevent disease outbreaks.
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