At present, the main pond raising young shrimp can achieve better economic benefits if it can increase the average yield per unit area to 80 kg/mu. The key technologies for improving the yield per unit area of ​​the main pond raising shrimp in the pond are described below:

First, pond conditions. (1) Water source. Adequate water sources, clean and non-polluting water quality, in line with fishery water standards, convenient drainage and drainage. (2) shrimp ponds. The area should not be too large, preferably 0.201-3.35 hectares. (3) shrimp pond slope and water depth. Slope 1:2.5-1:3, water depth 1.2-1.5 meters. (4) bottom material. Sludge is no more than 10 cm and the bottom is inclined to the drainage.

Second, preparations for stocking. (1) Clear pond. Seventy to ten days before stocking, the whole pool was splashed with 75 kg of calcified water, completely destroying wild fish and pathogens. (2) Water injection. After 4 days in the clear pond, the water injection is 50 centimeters. (3) Shi Ji Fei. 300-400 kg of fermented organic fertilizer is applied per mu before water injection. (4) Planting plants. Planting aquatic plants such as Vallisneria, Elodea, and Marais, etc. along the shallow waters around the pond, and the planting area of ​​aquatic plants accounts for about 40% of the shrimp pond area.

Third, the stocking mode (the implementation of two stockings) (1) The first crop yields about 50 kg. Restocking time from late July to early August, stocking specifications 2 cm per acre shrimp 40,000-50,000. Stocking should be done in the morning and evening on a sunny day to avoid direct sunlight during the day and one foot at a time. In order to regulate water quality and control the autumn season, fishes such as calyx must be stocked. There are two methods of polyculture, one is polyculture of old buds, 0.3 kg per acre stocking size/flower bud of 30 tails, and the second is mixed flower buds and group head amaranth summer flowers, each with 800 acres. From the first day to the end of December, the dry pool ends. (2) The second larvae with a stocking size of about 3 cm from January to September are stocked with 20 kg per mu. Monoculture, not polyculture. To the end of June the following year.

Fourth, feeding and management. (1) Water quality. Always maintain good water quality and suitable water levels during the cultivation period. According to shrimp pond water color and transparency and other conditions, timely injection, drainage, water quality regulation, keep the pool water-soluble oxygen is sufficient and fresh water, promote shrimp growth and clam shell. During the rearing period, water should be changed frequently. If you change the water regularly without conditions, regular amount of photosynthetic bacteria and sediment improver can be spilled regularly. During the rearing period, lime and phosphate fertilizers should be applied in a timely manner according to the pool water, pH value and calcium and phosphorus content. Lime consumption is 10-20 kilograms per acre, and each use of superphosphate is 8-10 kilograms per acre. In general, cast once every 15 days or so. (2) feeding and fertilizing. Feed should be mainly composed of fresh shrimp pellets, supplemented by live bait such as snails and small trash fish, and the protein content of pellet feeds should be more than 35%. Appropriate feeding temperature of the shrimp is about 25°C. Feeding should be done with "four settings" (timing, qualitative, quantitative, and fixed). During the initial period of feeding, appropriate feeds should be poured on the whole pond, and they should be put into the shallow pool on the pool and fed on the feeding belt at a later time. A feeding point should be set every 1-2 meters. The number of feedings is usually 2 times a day. When the water temperature is 25-30°C, it should be fed 3 times a day. 1/3 in the morning and 2/3 in the afternoon. Feeding should be even, so that the whole pond can eat and eat. The daily feed of artificial compound feed can be tested by 2.5-5% of the pond body weight first, and then adjusted according to the feeding conditions of the shrimp. Generally eaten within 1-2 hours after feeding. The amount of pooled shrimp can be roughly estimated based on the average of the unit area and the average weight of the shrimp. In order to multiply the natural food organisms in the pond, timely and appropriate fertilizer should be applied according to the color and transparency of shrimp ponds. The color of the pool water is more suitable for yellowish green or dark brown, and the transparency is preferably about 30 cm. (3) Aquatic plants. According to the growth of aquatic plants, fertilizers should be sprayed in the planting area in time. Fertilizer concentration should not be too large, so as not to cause damage. (4) Daily management. Shrimp pool must be specially managed, stick to the pond for 3-4 times a day, and take timely measures to identify problems. Pay attention to environmental sanitation in shrimp ponds and strengthen the prevention and control of pests and diseases in shrimp.

V. Shrimp fishing. Spring shrimp is generally marketed from late April, and will be produced at the dry pool by the end of June. Autumn shrimp will be harvested in stages starting from October, catching up to stay small, and will be produced in dry ponds in December and January.

In-phase fishing is generally carried out in cages, which are carried out continuously for 5-6 days each time, and then rest for a few days before catching. In December, when the water temperature dropped, the shrimps moved into the deep waters and lurked in aquatic plants, and they entered the wintering period. At this time, the nets could be used to dip nets in waterweeds or shrimp trawls to capture the bottom of the ponds. Green shrimp less than 4 cm in length reproduce in the same year of August and can be reserved for shrimp species cultivated in the spring of the following year.

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