Macrobrachium rosenbergii has the advantages of high food intake, fast growth, and high yield, but it is not tolerant to low temperatures. In China's Yangtze River and Huaihe River basin, the use of shrimp ponds is actually only half a year (May to October). The shrimps have a wide temperature range and grow rapidly. It is characterized by strong fertility, delicious meat, and high economic value. In order to increase the breeding efficiency of ponds, the growth cycle of Macrobrachium rosenbergii can be shortened (within 100 days) by increasing stocking specifications and strengthening feeding management in the actual production process. On the other hand, measures for secondary stocking are adopted to extend the growth time of the shrimp so that the second-round rotation of Macrobrachium rosenbergii and fresh shrimp can be achieved. Here's a preliminary summary of the trial we conducted in 1999. 1 Conditions and methods 1.1 Test pool: 22# and 23# shrimp ponds in Qianzhuang Aquatic Products Field, Maanshan City, with the same area of ​​5 mu, rectangular in east-west direction, flat bottom, 15cm thick sludge, and 1.5m deep water retention. 1.5 kW aerator. The first-stage holding pool is the Maosetang of the two production ends of the field, with an area of ​​1.2 mu and 1.3 mu respectively. The bottom of the pool is flat, and the water depth is 1m. It is used to cultivate young shrimps in late July. 1.2 Pond clearing: Drain the pool water on April 30, disinfect it with 100kg/ha calcined water, and then expose it for one week. At the end of the pond, a 3m deep 0.5m deep shrimp pond is excavated to facilitate the shrimp ponds. 1.3 Water source conditions: Adequate water source, fresh water, rich dissolved oxygen, convenient drainage and irrigation. One week before the shrimp enters the pond, it is 50cm in water, and the water level is gradually increased. Each influent water must be filtered with a 60-mesh screen to prevent wild fish and predators from mixing into shrimp ponds. 1.4 Setting up Concealed Species: A row of black seaweed was planted on both sides of the pond and in the middle of the pond to serve as a habitat for M. rosenbergii and clam shell sites. When shrimp was farmed in September, peanuts were used as concealed objects, and three rows were fixed in several points using bamboo to prevent wind drift. The total area of ​​concealed objects accounts for about one-fifth of the surface of the pond. In winter, put some bamboo sticks along the pond for shrimp attachment. 1.5 Research Methods: Large shrimps of Macrobrachium rosenbergii were launched in mid-May and they were caught at the end of August to complete the first culture. In the second half of July, the first-stage holding tanks will be used to cultivate young shrimp seedlings. In early September, the young shrimps of Yuda will be placed in the test pool for secondary feeding and will be sold in April of the next year, so that one year of breeding will be realized. the goal of. 2 Seed stocking 2.1 Macrobrachium rosenbergii seedlings: On May 13th, they were purchased at the Nanjing Special Aquaculture Breeding Center, with a specification of 2.0 cm totaling 150,000 tails and 15,000 acres of seedlings. The shrimps are of neat specifications, robust in physique and complete in limbs. 2.2 Green shrimp seedlings: On July 26th, 1 million larvae of the breeding stock were transferred to two temporary holding ponds. Soymilk and 38% of powdered open material containing crude protein were fed three times a day. After holding for 42 days, the size of the pool reached 2.5cm on September 6th. A total of 300,000 seedlings were raised to the test pool, and 30,000 mu were planted. 2.3 Mixed fish fry: In order to make full use of the water body and adjust the water quality, the test pool has also taken part of the white plover and a small amount of silver larvae. After the larvae are stocked, they are released at intervals. See Table 1 for detailed stocking conditions. Table 1 Seedling stocking table No. 1 No. 2 沼 Macrobrachium rosenbergii White 鲢 Silver 鲫 Prawn 鲢 Silver 鲫 Silver 鲫 Silver 鲫 Time (Month.day) 5.13 6.15 6.15 9.6 10.5 10.5 Specification (cm) 2 3 2 2.5 8 4 Quantity (tail ) 150000 10000 2000 300000 3000 1000 3 Feeding and Management 3.1 Pond Fertilization: When the shrimp ponds require a variety of food organisms, the chicken manure and pig manure are applied four days in advance. The amount of 200 kg/mu is used to cultivate plankton. Do not top-dress in hot season. In winter, in order to maintain the fatness of the pool, topdressing organic fertilizer once every 20 days, the amount of 200kg/mu. 3.2 Water Quality Control: Shrimp ponds have strict requirements on water quality. If they are too thin, they have less food organisms, which can affect growth and mutual killing. Feeding and fertilizing can easily cause water deficiency. Therefore, it is necessary to supplement new water once every 10 days, each time 15cm, lime water once every 20 days, each dosage of 20kg/mu, adjust the water quality, but should avoid the shell phase. Oxygen is normally turned on, and the dirt and residual baits in the pool are promptly removed to maintain the transparency of the water 35cm. The winter shrimp pond ensures deep winter weather. 3.3 Feeding of bait: The experimental feed is the macrobrachium rosenbergii and green shrimp special material produced by Dajiang Company, containing 32% to 36% of crude protein. Animal feed is the low-value fish provided by this field. In the first month of the shrimp pond, it was distributed at 9am (20%), 3pm (20%) and 7pm (60%) every day. ) Twice. In addition, feed 3 to 5 kg of minced bait fish once a day at 10 am. The specific amount of bait depends on the weather, water quality, water temperature, and shrimp feeding conditions. When feeding, it should be evenly placed on the edge of the 2m-side waterweed strip. From mid-December to early March, due to low water temperatures, pellets are only dosed once a week, 10 to 15 kg each time. 3.4 Disease Prevention and Management: Adhere to the morning and evening patrol ponds to timely learn the activities of shrimp, anti-theft, anti-virus, especially in summer and autumn, hot or thundery weather, the next night should be carefully observed the pond to prevent oxygen-deficient pan. In terms of disease prevention, in addition to fresh water and lime, timely water disinfectants kill germs. During the breeding period, no other diseases occurred. Water animals, water snakes, frogs, pond herons and other predators should be urged to expel. 4 Production and Benefits 4.1 Macrobrachium rosenbergii: Since August 10, 1999, we have used cages, dip nets, and other tools to catch large and small fish. At the end of the month, we have cleared the pool's water and grass, caught the nets, and captured them on the August 30th. Specifications up to 8 ~ 13cm. 4.2 Fresh shrimp: On March 24th, 2000, the largest size has reached 7cm, and the biggest size has reached 7cm. Afterwards, the large catching small catches up to be listed one after another. On April 26, the peanuts and bamboo shoots are removed, and the net is caught. April 30. Day dry pond nuclear production. Two aquaculture production and output values ​​are shown in Table 2. Table 2 Harvesting status of fish and shrimp No. 1 of the second crop of Macrobrachium rosenbergii White bream Silver prawn White bream Silver bream fishing time August 30 August August 30 April 2000 April 30 April 30 day average size 10cm 25 tails/kg 30 tails/kg 6cm 15 tails/kg 22 tails/kg weight (kg) 1284 298 58 585 176 43 Production value (yuan) 44940 1192 464 35100 704 344 4.3 Benefits: The total output value of the test 82,744 yuan, while the total cost is 40,970 yuan, and the net profit is 41,954 yuan. The net profit of Mu is 1,915.4 yuan, and the input-output ratio is 1:2.03. 5 Experience 5.1 Two years of breeding of Macrobrachium rosenbergii and freshwater prawn, the method is practicable, easy to operate, since the sale of shrimp to avoid the peak of their respective listing, so the price is high, and the efficiency is good. The experimental pool reached 4195.4 yuan, which was significantly higher than that in the single season. 5.2 Use large seedlings to shorten the growth period of Macrobrachium rosenbergii. At the same time, the use of temporary holding pools to strengthen the cultivation of young shrimps to extend the growth period of the shrimps, so that the two cockroaches are closely linked, no delay, and give full play to the benefits of the pond. 5.3 After the first-stage cultivation of the young shrimps, the secondary feeding specifications have been increased, and the survival rate has been improved compared with the purchased shrimp seedlings. After the autumn, the stocking has reduced the large-scale reproduction of the green shrimp, which can reduce the consumption of feed and increase the commodity rate. 5.4 Rotating Macrobrachium rosenbergii and freshwater prawn in two tiers, adequate food and scientific feeding methods are the keys to high yields. Especially with animal feed formulated feed, breeding effect is obvious. 5.5 Qinqin Xinshui, normally open aerators, regular water body detoxification, and maintaining a healthy breeding environment are the guarantee for high yields.
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