In the autumn, the young shrimps have been raised for more than 100 kilograms per mu over a period of 2 months. Due to the large size, easy-to-sell, and high market prices of shrimp, the net profit per mu can reach more than 4,000 yuan, which is 2.5 times higher than the general aquaculture efficiency.
Pond requirements
The water source is non-pollution, and it is convenient for injection and drainage. It has an area of ​​2 to 4 mu and a water depth of 1.2 to 1.5 meters. It is inclined from the inlet to the outlet and the sludge is about 5 centimeters. Sandy loam is preferred as the bottom soil; pool lofts are more than 2 meters wide and slope ratio is 1:3 to 4. Pool slopes should have large shallow beach feet, shallow water depth of about 0.4 meters, and smooth slopes, no weeds No leakage, each pool has an independent intake and drainage system, and equipped with filtration and anti-escape equipment; equipped with 0.5 to 1 kW impeller-type aerator per acre.
After clear ponds, aquatic plants such as leeks or lotus seeds are planted on the surface of water bodies. The landing area is preferably 25% to 30% of the total surface area, and an appropriate amount must be set in the middle of the water layer. Multi-layer artificial shrimp nests to improve the ecological environment, increase the stocking density of the shrimp and increase the yield.
Scientific stocking
The first requirement is timely. If it is too early to fish, due to low catches, low seed resources and high prices, the water temperature is still high. Even after short-distance transportation, the survival rate will be affected. However, when the stocking time is too late, shrimp pond water temperature is low and the shrimps feed on the shrimps. The rate is low and growth is slow. Practice has shown that in the upper and lower pools in September, the shrimps have a growing period of about 2 months before winter, and they can grow into prawns only after 3 times of molting. Can be listed on the New Year's Day, the Spring Festival, and increase production and efficiency.
Followed by scientific irrigation and fertilization. Before the juveniles are stocked, the shrimp ponds should be deepened to 80 cm before they are stocked for 7 to 10 days. When they enter the water, 40 mesh, 60 to 80 mesh, and 80 to 100 mesh nylon sieves are used for the tertiary filtration. At the same time, 300 to 400 kg of Mushi are cooked. Livestock and poultry manure, fertilization method to the whole pool evenly spilled to the residue of the fertilizer is appropriate.
Once again, we have a reasonable amount of stocking. Put about 15 kg of 2 to 3 cm juvenile shrimp on the acre, requiring the same specifications, complete limbs, and healthy shrimp. When the juveniles are in the pool, they must “test the water†to avoid excessive temperature difference; and set a piece of screen mesh of about 8 square meters horizontally in the shrimp ponds, with a draught of 8 to 12 centimeters, and gently pour the slow-watering shrimp on the mesh. In the middle, let him free the net to dive into the bottom of the water. After a certain period of time, he is still injured on the mesh. He should remove it.
Feeding
After juvenile shrimp are released into the pool, they should be fed daily. There is no special feed for shrimp, and it is generally replaced by Macrobrachium rosenbergii feed. Production is usually based on feeding bean cakes, supplemented with wheat bran, rice bran, and animal foods such as minced wild fish, snails, and oysters. When the water temperature is at 20°C, the daily feeding amount accounts for about 10% of the total pond shrimp weight. When the water temperature is 15°C, the feeding amount is about 7%. With the gradual decrease of the water temperature, 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 feed. Feeding twice a day, ie 7-8 am and 4-5 pm.
When feeding, set a point and choose a shoal with a depth of about 50 cm. Powdery baits, such as bean cakes, should be soaked in advance and then kneaded into lumps.
Daily management
Within 7 days of prawns entering the pool, the depth of water is kept 1 meter. Gradually add water after 7 days, and the water level will reach 1.5 meters in 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. Aerators are generally open from midnight to before sunrise, and rainy days should be opened all day. Sometimes, in order to fully expose the bottom of the pool, an aerator can be opened at 2 o'clock in the sunny afternoon to prevent the floating head of the shrimp. Once the floating head emerges, the aerator must be opened in time and new water should be added.
Disease prevention and treatment
Due to the strong disease resistance and less incidence of the shrimps, disinfection and prevention are currently the mainstay. Generally, lime slurry is mainly used for splashing, splashing twice a month, about 15 kilograms per acre, and 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 shrimp clams.
Pond requirements
The water source is non-pollution, and it is convenient for injection and drainage. It has an area of ​​2 to 4 mu and a water depth of 1.2 to 1.5 meters. It is inclined from the inlet to the outlet and the sludge is about 5 centimeters. Sandy loam is preferred as the bottom soil; pool lofts are more than 2 meters wide and slope ratio is 1:3 to 4. Pool slopes should have large shallow beach feet, shallow water depth of about 0.4 meters, and smooth slopes, no weeds No leakage, each pool has an independent intake and drainage system, and equipped with filtration and anti-escape equipment; equipped with 0.5 to 1 kW impeller-type aerator per acre.
After clear ponds, aquatic plants such as leeks or lotus seeds are planted on the surface of water bodies. The landing area is preferably 25% to 30% of the total surface area, and an appropriate amount must be set in the middle of the water layer. Multi-layer artificial shrimp nests to improve the ecological environment, increase the stocking density of the shrimp and increase the yield.
Scientific stocking
The first requirement is timely. If it is too early to fish, due to low catches, low seed resources and high prices, the water temperature is still high. Even after short-distance transportation, the survival rate will be affected. However, when the stocking time is too late, shrimp pond water temperature is low and the shrimps feed on the shrimps. The rate is low and growth is slow. Practice has shown that in the upper and lower pools in September, the shrimps have a growing period of about 2 months before winter, and they can grow into prawns only after 3 times of molting. Can be listed on the New Year's Day, the Spring Festival, and increase production and efficiency.
Followed by scientific irrigation and fertilization. Before the juveniles are stocked, the shrimp ponds should be deepened to 80 cm before they are stocked for 7 to 10 days. When they enter the water, 40 mesh, 60 to 80 mesh, and 80 to 100 mesh nylon sieves are used for the tertiary filtration. At the same time, 300 to 400 kg of Mushi are cooked. Livestock and poultry manure, fertilization method to the whole pool evenly spilled to the residue of the fertilizer is appropriate.
Once again, we have a reasonable amount of stocking. Put about 15 kg of 2 to 3 cm juvenile shrimp on the acre, requiring the same specifications, complete limbs, and healthy shrimp. When the juveniles are in the pool, they must “test the water†to avoid excessive temperature difference; and set a piece of screen mesh of about 8 square meters horizontally in the shrimp ponds, with a draught of 8 to 12 centimeters, and gently pour the slow-watering shrimp on the mesh. In the middle, let him free the net to dive into the bottom of the water. After a certain period of time, he is still injured on the mesh. He should remove it.
Feeding
After juvenile shrimp are released into the pool, they should be fed daily. There is no special feed for shrimp, and it is generally replaced by Macrobrachium rosenbergii feed. Production is usually based on feeding bean cakes, supplemented with wheat bran, rice bran, and animal foods such as minced wild fish, snails, and oysters. When the water temperature is at 20°C, the daily feeding amount accounts for about 10% of the total pond shrimp weight. When the water temperature is 15°C, the feeding amount is about 7%. With the gradual decrease of the water temperature, 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 feed. Feeding twice a day, ie 7-8 am and 4-5 pm.
When feeding, set a point and choose a shoal with a depth of about 50 cm. Powdery baits, such as bean cakes, should be soaked in advance and then kneaded into lumps.
Daily management
Within 7 days of prawns entering the pool, the depth of water is kept 1 meter. Gradually add water after 7 days, and the water level will reach 1.5 meters in 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. Aerators are generally open from midnight to before sunrise, and rainy days should be opened all day. Sometimes, in order to fully expose the bottom of the pool, an aerator can be opened at 2 o'clock in the sunny afternoon to prevent the floating head of the shrimp. Once the floating head emerges, the aerator must be opened in time and new water should be added.
Disease prevention and treatment
Due to the strong disease resistance and less incidence of the shrimps, disinfection and prevention are currently the mainstay. Generally, lime slurry is mainly used for splashing, splashing twice a month, about 15 kilograms per acre, and 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 shrimp clams.
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