Prawn cultivation technology

In the autumn, 4 cm long green prawns are purchased and intensively cultivated in the holding pool for 3-4 months. They are listed on the New Year's Day and the Spring Festival. The shrimps can be weighted more than twice as much, and the selling price can be increased, and good results can be obtained. Economic benefits.

Temporary pond selection and preparation The area for the temporary holding of the shrimp is 2000-3000 square meters. The slope ratio of the pond is 1:2.5 to 1:3, the water depth is 1.5-2 meters, and the silt layer at the bottom of the pool is not more than 10 centimeters thick. Open a shallow ditch at the bottom of the pond and dig a shrimp pond 5 meters long, 3 meters wide and 0.5 meters deep outside the outlet. Before the raising of the shrimp, dry the pool thoroughly and expose it to the sun for a week or so. Then dry it until the bottom of the pool opens. Ten days before the stocking of shrimp, the water is about 30 centimeters deep, and the whole pool is splashed with 50-70 kilograms of quicklime per acre. Transplant water grass or set shrimp nests. In addition, 0.5-1 kilowatts of aerators are provided for each acre of water surface, and one water pump is provided for each 2000-3,000 square meters of water surface.

Temporary rearing time and selection of shrimps. Selection of freshwater shrimps should be selected in mid-to-late September. At this time, raising the shrimps will allow sufficient growth period. Select freshly bred shrimp with a length of about 4 cm, complete appendages, strong vigor, and no eggs. Soft shell shrimp was removed before stocking. Amount of 70-100 kg per acre of water.

Feeding in the autumn is the second growing season of the shrimp. It should be fed with high-quality feed. In order to feed the full-strength feed pellets of shrimps, supplemented by animal feed, it is required that the particle size of pellets be 2-4 millimeters, the content of crude protein be 35%-40%, and animal feed should be crushed. Every day at 8-9 am and 6-7 pm. The amount of feed in the morning accounted for 1/3 of the total feeding amount in the day. The daily feeding amount is 3%-5% of the total weight of shrimp in the pond (refers to dry matter, and the amount of fresh material accounts for 10%-15%), and can be flexibly controlled depending on the weather, water quality, water temperature, and feeding conditions of the shrimp. In the morning, animal feed is mainly used, and in the afternoon, pellet feed is mainly used.

Water Quality Management The requirements for water quality of the shrimps are: water transparency 35-40 cm, dissolved oxygen per liter of water more than 5 mg, and pH 7-8. Fill new water every 15-20 days, drain first, and drain about 30 centimeters each time. In order to further control Qiu Fan, from the time of stocking to the beginning of October, the transparency of the pool water can be adjusted to more than 40 cm. After the autumn and winter period, appropriate fertilization will be applied to keep the transparency of the pool water at about 30 cm. At the same time, the water level is adjusted according to the temperature and season, and the water depth is maintained at 1-1.2 meters from September to October, and the water depth should be maintained at about 1.5 meters after entering the winter.

Prevention of floating head intolerance of hypoxia hypoxia, dissolved oxygen per liter of water is lower than 1.12 mg can lead to death, so we must adhere to the morning and evening tour pond, timely opening aerator, so sunny noon open, cloudy early morning, continuous rainy days Open in the middle of the night. If signs of floating head are found, they must be filled with water and oxygen, and if necessary, chemical oxygen stimulators should be used first aid. Falling thunderstorms in the autumn evening are prone to serious floating heads and should be prevented in advance.

Disease Prevention During the holding period, fresh shrimps have large stocking densities, large feeding amounts, rapid changes in water quality, and proneness to diseases. Preventive measures: 15-20 days per acre with 15 tons of lime water Quanchiposa 1 time; every 20 days per cubic meter of water with oxytetracycline 1-2 grams of water Quanchiposa 1, prevention Black shrimp and black body disease.

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