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Autumn leisure fish ponds have benefited from raising shrimp
In the late autumn and early winter, the use of summer fish ponds, single carp, tilapia and other fish ponds that are not tolerant to low temperatures can quickly ensure that the green prawns have a growing period of about two months before winter, and the fur is three times longer. Into the prawn, per mu can produce shrimp 50 to 60 kg. Due to the large size of shrimps, and the value of New Year's Day, listed before and after the Spring Festival, can achieve the purpose of increasing production and efficiency, net income per mu of up to 1500 to 2,000 yuan. The specific technical points are now described as follows: 1. After the application of quicklime clear ponds, the green ponds are planted with aquatic plants such as water peanuts, water spinach or lotus seeds on the surface of the water. The landing area is preferably 25% to 30% of the total surface area. Before juveniles are stocked for 7 to 10 days, the depth of the pond should be increased to 80 cm. In order to enter the water, it is necessary to use a 40-mesh, 60-80 mesh, and 80-100 mesh nylon screen mesh for tertiary filtration. At the same time, 200-300 kilograms of decomposed livestock and poultry fertilizer are applied per acre, and the fertilization method in which the whole pool is uniformly sprayed to slag is appropriate. The stocking density of the shrimp is generally about 15 kilograms per hectare of young shrimp of 2 to 3 cm in size. Requirements of uniform specifications, complete limbs, swimming and lively. When the juveniles are in the pool, they must first put a few shrimps to “test the water†so as to avoid a large number of deaths of the shrimp due to excessive temperature difference. Second, the bait should be fed daily after feeding the young shrimp into the pool. It is usually fed with bean cakes, supplemented with wheat bran, rice bran, and animal foods such as minced wild fish, snails, and oyster meat. When the water temperature is 15°C, the feeding amount is about 7% of the shrimp body weight. As the water temperature gradually decreases, the feeding amount should be reduced accordingly. Animal diets should be fed every other day, generally accounting for about 20% of the total amount of bait. The number of feedings per day is 2 times, ie, 7 to 8 am and 16 to 17 o'clock in the afternoon. When feeding, it should be set at a shallow depth of about 50 cm. If the powdered bait such as bean cake, etc., should be soaked in advance, and then squeeze into a lump. Third, the daily management of young shrimp into the pool within 7 days, the water depth remained at 1 meter. Gradually add water after 7 days and reach a water level of 1.5 meters in about 15 days. Keep the pH of the pool water stable between 7 and 7.2. In addition, it is necessary to change the water in 8 to 10 days. The oxygen aerator is usually open from midnight to before sunrise. The rainy days should be open all day. Sometimes the bottom is fully aerated, and the aerator can be added on a sunny day at about 14:00 to prevent the shrimp Floating head." Once the floating head emerges, the aerator must be opened in time and new water should be added. In addition, the shrimps have stronger disease resistance and less incidence, and they are mainly based on disinfection and prevention. In practice, lime slurry is mainly used for prevention. Generally, it is splashed twice a month. About 15 kg of lime water is used per acre. Quicklime can not only act as a disinfectant, but also increase the supply of calcium ions in the water and accelerate the growth of the molting of the shrimp.