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With the warming of the weather, when the water temperature rises above 20°C, the shrimp begins to shell out. At this time, the shrimp body is susceptible to bruising. Before stocking, ponds should be well-grounded and quickly disinfected with bleaching powder, active iodine and other drugs. Ponds with moss, green algae, and bluegrass should also be sprayed once with copper sulfate. There is no need to artificially dig a ditch in the pool without shrimp gullies, which will not only facilitate the accumulation of water in the pool, but also facilitate the capture of shrimp. The stocking rate per acre depends on the size of the shrimp, generally controlled at 10-20 kg.
The pond water level where the shrimp has been reared is not easy to be low, the minimum water level is kept above 60 cm, and fresh water is added every 7 to 10 days. Water-slim ponds are piled with fermented organic fertilizer 200-400 kilograms.
5-10 kg. It plays a role in cultivating fertilizers, increasing natural animal foods, and reducing the occurrence of three hazards (moss, stinky green sand, blue net algae) in the pool. If the pond fertility is more than enough, then after the temperature rises, apply an inorganic fertilizer, 5~7.5 kg per mu. At the same time, the pond should be properly cultivated and transplanted with aquatic plants, accounting for about 30% of the total area.
Third, do a good food feed
When the temperature of the water rises above 18°C ​​when the weather is fine, feed should be fed in time. Start a meal every day, increase the temperature to normal once and then increase to the afternoon. Feed them with green barley, wheat bran, bean cake or full-price shrimp feed, and add animal feed such as small trash fish, fish meal, and feedstuffs to shrimp ponds. 6-3% of the amount. Do a good job of inspection after feeding, according to the daily diet of shrimp, increase or decrease the amount of feed in time to adjust, not only to prevent waste, but also to prevent inadequate feeding.
Fourth, to prevent shrimp disease hazards
After stocking, normal shrimp ponds can use bleaching powder and active iodine Quanchiposa once in mid-March to prevent bacterial infections caused by bumps. During the inspection, if ciliosis is found in the shrimp body (time), the “parasites†must be used first to kill the parasites, and then the bactericidal drugs (such as chlorine dioxide) should be used to kill the bacteria in intervals of 5-7 days. Prevent black shank disease and red spot disease.
Fifth, prevent floating can not be ignored
In spring, although there will not be a large number of hypoxic floating heads like high temperature in summer, after a sudden increase in temperature, if there is prolonged rain, the water level will be shallow and the water quality will be poor. The improper use of drugs will cause precipitation and rot and dry ponds after the death of many blue algae. After the pond has not been suntanned, shrimp stocks are overstocked, and the shrimp body becomes ill, it is easy to cause anoxic floating heads. Therefore, it is still necessary to look closely at shrimp ponds, pay attention to changes in weather and water quality, not blindly use drugs, pay attention to adding fresh water frequently, and do a good job of anti-floating work. For shrimp ponds with high stocking densities, aerators should be activated at noon for 1-2 hours to increase dissolved oxygen in the water to prevent dead shrimp caused by lack of oxygen.
Spring shrimp high-yield and high-quality breeding management
I. Timely shrimp seed cultivation