The city of Pulandian, Liaoning province, has had a history of many years of development. However, due to lack of funds and low technical level, coupled with the aging of the cultured shrimp ponds, the survival rate of the culture is low and the diseases occur from time to time, resulting in loss of production and loss of some breeding units. The healthy development of the aquaculture industry.
I. Problems existing in current shrimp pond polyculture
1. Neglecting shrimp pond dredging or plowing. For many years, the old pool of shrimp cultivation has not been subject to dredging or ploughing to raise seedlings. Due to the high content of hydrogen sulphide in shrimp ponds, the high temperature season in July to August has often caused the occurrence or death of culverts in the pond, bringing about aquaculture production. Serious economic loss.
2. The purpose of the introduction is not clear, with a certain degree of blindness. In recent years, due to the scarcity of clams, some units or individuals do not purchase seedlings in a planned and planned manner. Instead, they blindly purchase and stockpile seedlings as long as they are seeded. They ignore the quality of seedlings, their size, and their origins. where? How is the health of the seedlings?
3. The seed size purchased is small and the survival rate is low. In recent years, the city's purchase of sorghum seedlings has a specification of between 4,000 and 10,000 granules per kilogram per kg. Breeding takes about two years and the harvest rate is only 25% to 30% on average. The minimum is less than 20. %.
4, the daily management work is not enough attention.
5. The lack of a sound introduction management system and supporting laws and regulations.
Second, the discussion and recommendations
1, preparations (1) dredging, the entire pool, disinfection. After harvesting each year in autumn, bleaching powder and other drugs should be used to kill crustaceans in the pool, and then drained in the pool. Before and after the Spring Festival, remove mud from the beach surface and in the ditch, and then use a tractor to plow till the bottom of the pool is plowed once to fully expose the sun. One month prior to planting, 75kg of quicklime was sprayed and disinfected per acre, and a 60 mesh cone-shaped net was installed at the inlet. The pond was flushed with water several times.
(2) water, fertilizer and water. The water was started within half a month before the seedlings were released, and the water was supplied for 40 cm at the first time. Fermented chicken manure, bean cake, and urea fertilizer were applied. After about 7 days, the water was again received 60cm, and fertilizer and water were applied again. The pool water was adjusted to yellowish green and the transparency was about 30cm.
2, seed sources and specifications (1) seed sources. The best from the environment, water temperature, water quality and other similar conditions, it is best to raise 2 instar seedlings, shell length 2.5cm, specifications 140 / kg ~ 200 / kg, when the up to the commodity specifications, recovery rate 70% to 80%. Seeds require fresh, two shells closed, no damage to the surface Guanghua, neat specifications.
(2) Seed transport. The purchase and transportation of seedlings will be carried out around mid-March. The peony seedlings will be packed in woven bags of 30kg to 40kg per bag. The backlog of woven bags will not exceed 3 layers to prevent crushing of shells. Avoid rainy weather, the transit time on the way generally does not exceed 15 hours.
(3) seeding. After Pui Miao was transported, he first removed mixed predators such as snails, and immediately sprinkled them, paying attention to avoiding the ditch and gate, and evenly spreading it on the beach.
(4) Seedling density. According to the size of the shrimp pool ecological control ability to broadcast seed. Shrimps have higher stocking densities, more feeding, higher primary productivity in shrimp ponds, and larger stocking densities of shellfish.
3. Routine management (1) After the seeds are released, they should insist on frequent patrols, take regular samples, and pay attention to record the water quality and the growth of shrimp and shellfish. If any abnormalities are found, take timely remedial measures.
(2) Water quality regulation: In mid-April, when the seedlings are planted till the inception of July, add water 10cm to 20cm during each flood season, and maintain the water level at about 80cm. The transmission of sunlight is preferred. Immediately after adding water, topdressing fermented chicken manure, bean cake, urea and diammonium fertilizers were applied. The transparency of the water body was maintained at 30 cm to 40 cm, and the water color was yellow-green or yellow-brown. After entering into the volcano in July, use a large water change period during the big tide, re-incorporate the new water to 60cm to 80cm, and immediately apply inorganic fertilizer to promote the proliferation of diatoms and plankton in the pool water, and gradually add water to 80cm to 100cm. The water transparency is about 30cm. Strict waterproof and lean, until the beginning of autumn, each time during the big tide is a big change of water.
Always measure the pH of the pool water and keep it between 7.5 and 8.5. When the pH is too low, throw lime properly to improve water quality and prevent eutrophication.
4. Harvest According to the market conditions, generally, the harvest will begin in November, and all the harvesting will be completed before the New Year's Day. Some of the smaller specifications will be listed and listed in the next year.
In short, in actual work, due to the constraints of various factors, aquaculture producers must have a scientific mind, proceed from the actual situation, and scientifically implement the polyculture of shrimp and shellfish, and accumulate experience from it, and strive to continuously raise the economic efficiency of aquaculture.
I. Problems existing in current shrimp pond polyculture
1. Neglecting shrimp pond dredging or plowing. For many years, the old pool of shrimp cultivation has not been subject to dredging or ploughing to raise seedlings. Due to the high content of hydrogen sulphide in shrimp ponds, the high temperature season in July to August has often caused the occurrence or death of culverts in the pond, bringing about aquaculture production. Serious economic loss.
2. The purpose of the introduction is not clear, with a certain degree of blindness. In recent years, due to the scarcity of clams, some units or individuals do not purchase seedlings in a planned and planned manner. Instead, they blindly purchase and stockpile seedlings as long as they are seeded. They ignore the quality of seedlings, their size, and their origins. where? How is the health of the seedlings?
3. The seed size purchased is small and the survival rate is low. In recent years, the city's purchase of sorghum seedlings has a specification of between 4,000 and 10,000 granules per kilogram per kg. Breeding takes about two years and the harvest rate is only 25% to 30% on average. The minimum is less than 20. %.
4, the daily management work is not enough attention.
5. The lack of a sound introduction management system and supporting laws and regulations.
Second, the discussion and recommendations
1, preparations (1) dredging, the entire pool, disinfection. After harvesting each year in autumn, bleaching powder and other drugs should be used to kill crustaceans in the pool, and then drained in the pool. Before and after the Spring Festival, remove mud from the beach surface and in the ditch, and then use a tractor to plow till the bottom of the pool is plowed once to fully expose the sun. One month prior to planting, 75kg of quicklime was sprayed and disinfected per acre, and a 60 mesh cone-shaped net was installed at the inlet. The pond was flushed with water several times.
(2) water, fertilizer and water. The water was started within half a month before the seedlings were released, and the water was supplied for 40 cm at the first time. Fermented chicken manure, bean cake, and urea fertilizer were applied. After about 7 days, the water was again received 60cm, and fertilizer and water were applied again. The pool water was adjusted to yellowish green and the transparency was about 30cm.
2, seed sources and specifications (1) seed sources. The best from the environment, water temperature, water quality and other similar conditions, it is best to raise 2 instar seedlings, shell length 2.5cm, specifications 140 / kg ~ 200 / kg, when the up to the commodity specifications, recovery rate 70% to 80%. Seeds require fresh, two shells closed, no damage to the surface Guanghua, neat specifications.
(2) Seed transport. The purchase and transportation of seedlings will be carried out around mid-March. The peony seedlings will be packed in woven bags of 30kg to 40kg per bag. The backlog of woven bags will not exceed 3 layers to prevent crushing of shells. Avoid rainy weather, the transit time on the way generally does not exceed 15 hours.
(3) seeding. After Pui Miao was transported, he first removed mixed predators such as snails, and immediately sprinkled them, paying attention to avoiding the ditch and gate, and evenly spreading it on the beach.
(4) Seedling density. According to the size of the shrimp pool ecological control ability to broadcast seed. Shrimps have higher stocking densities, more feeding, higher primary productivity in shrimp ponds, and larger stocking densities of shellfish.
3. Routine management (1) After the seeds are released, they should insist on frequent patrols, take regular samples, and pay attention to record the water quality and the growth of shrimp and shellfish. If any abnormalities are found, take timely remedial measures.
(2) Water quality regulation: In mid-April, when the seedlings are planted till the inception of July, add water 10cm to 20cm during each flood season, and maintain the water level at about 80cm. The transmission of sunlight is preferred. Immediately after adding water, topdressing fermented chicken manure, bean cake, urea and diammonium fertilizers were applied. The transparency of the water body was maintained at 30 cm to 40 cm, and the water color was yellow-green or yellow-brown. After entering into the volcano in July, use a large water change period during the big tide, re-incorporate the new water to 60cm to 80cm, and immediately apply inorganic fertilizer to promote the proliferation of diatoms and plankton in the pool water, and gradually add water to 80cm to 100cm. The water transparency is about 30cm. Strict waterproof and lean, until the beginning of autumn, each time during the big tide is a big change of water.
Always measure the pH of the pool water and keep it between 7.5 and 8.5. When the pH is too low, throw lime properly to improve water quality and prevent eutrophication.
4. Harvest According to the market conditions, generally, the harvest will begin in November, and all the harvesting will be completed before the New Year's Day. Some of the smaller specifications will be listed and listed in the next year.
In short, in actual work, due to the constraints of various factors, aquaculture producers must have a scientific mind, proceed from the actual situation, and scientifically implement the polyculture of shrimp and shellfish, and accumulate experience from it, and strive to continuously raise the economic efficiency of aquaculture.
Shunwang Agricultural Products Co., Ltd. , http://www.qd-foods.com