First, prevent escape
Install anti-escape wall: on the surface of the pool, lay a firm plastic film on the pool, bury the bottom of the film in the mud 30 cm, and use bamboo or bamboo as the lining on the top, and place it at a certain distance Install a fixed pile, straighten the membrane, and then fix it. The upper part of the anti-escape wall can also be made of polyethylene mesh. The mesh is 2 cm. The height of the surface is 60-80 cm. The inlet and outlet must use fine mesh. Mesh (0.5 cm below) barbed wire is good. In the event of a daily patrol, if there is damage to the escape prevention wall and a seepage hole in the pool, prompt remedial measures should be taken.
Second, prevent killing each other
Crabs have the habit of fighting each other and eating the same kind of food. To properly solve the problem of self-mutilation, the following technical measures should be adopted. Within the same crab pool, the same batch of crabs should be stocked in the same size; pools are separated by bamboo foil or small mesh nets, so that the pool water is connected and the crabs are separated. The plastic film is added to the exposed surface of the bamboo foil and mesh to prevent crabs from crossing the border. As far as possible, ensure that the density is equal; in the pool, artificially build some such as small mound, willow root heap (1.0 mg / kg potassium permanganate disinfection), in order to facilitate its hole, burrowing. A small amount of aquatic plants such as Hydrilla verticillata and Water Lilies can also be planted to provide stealth and reduce fighting between shells. To ensure that the crabs eat the right amount of bait, it will greatly reduce the likelihood of their residual food. The amount of intensive fish pond feeding should be based on the season, the water temperature and the amount of left and right bait after the first and second days of feeding. For example, in April-April, the water temperature is lower (8-15°C), and the small amount of fine material is the standard; from May to June, the temperature is getting higher, increasing the amount of bait, and emphasizing the plant feed, such as the green leaves, Water lettuce, etc.; from July to October, the water temperature is high, mainly animal feed; after November, the water temperature decreases, and the amount of feed is reduced as appropriate. Feeding should be fixed and timed, and it is appropriate to spend 3-5 p.m. every day in order to feed at night.
Third, the water body hypoxia
The best way to make the crab pool fresh and rich in oxygen is to change the water. Before changing water, it is necessary to strictly control the quality of water sources and prevent all kinds of polluted and inferior water from entering the pool. Before June, after October, the water temperature is lower, change the water once every 10 days, the amount should be small, about 1/4; July-September, the water temperature is high, change the water 1 time in 5 days, the amount should be large, about 1 /3. The activities of crabs are normal, and the amount of water exchanged is small, and vice versa.
Quicklime can kill bacteria, make the suspended organic matter in the pool cemented, and clarify the water in the pool. The increase of calcium ions in the water makes the sediment mineralized to release phosphorus, potassium and other ions. During the high-temperature season after July, crabs thrive, and these inorganic salt ions in the water are necessary for their oyster shells. In the months of July, August and September, half of the lime is spun once every 15-20 kilograms per acre. In the remaining months, once a month, the amount is slightly reduced.
Fourth, prevent disease, enemy
Before stocking, the crabs should be dredged and the sediment should be 20 cm thick. With water clearing pond, the water depth is 1 meter per acre, and 130-150 kg of quicklime slurry is evenly spread over the pool surface and the pool wall. The crabs entering the pool were bathed with 4% saline for 5 minutes, and the plants were soaked with 1 mg/kg potassium permanganate solution for 20-30 minutes. With 1 mg/kg oxytetracycline Quanchiposa, can prevent bacterial diseases; with 25 mg / kg of formalin Quanchiposa, can prevent parasitic diseases; with 0.1 mg / kg malachite green liquid The pool is spilled to prevent fungal diseases.
The main enemy of river crab is rats, frogs, otters and so on. When clearing the pool, the frog eggs, cockroaches, and otters in the pool are completely removed. The inlet should be filtered with a wire mesh wire mesh. The anti-escape wall around you must be strong and intact to prevent frogs from jumping in. Anti-escape wall placed outside the wall of rats such as zinc phosphide.
Install anti-escape wall: on the surface of the pool, lay a firm plastic film on the pool, bury the bottom of the film in the mud 30 cm, and use bamboo or bamboo as the lining on the top, and place it at a certain distance Install a fixed pile, straighten the membrane, and then fix it. The upper part of the anti-escape wall can also be made of polyethylene mesh. The mesh is 2 cm. The height of the surface is 60-80 cm. The inlet and outlet must use fine mesh. Mesh (0.5 cm below) barbed wire is good. In the event of a daily patrol, if there is damage to the escape prevention wall and a seepage hole in the pool, prompt remedial measures should be taken.
Second, prevent killing each other
Crabs have the habit of fighting each other and eating the same kind of food. To properly solve the problem of self-mutilation, the following technical measures should be adopted. Within the same crab pool, the same batch of crabs should be stocked in the same size; pools are separated by bamboo foil or small mesh nets, so that the pool water is connected and the crabs are separated. The plastic film is added to the exposed surface of the bamboo foil and mesh to prevent crabs from crossing the border. As far as possible, ensure that the density is equal; in the pool, artificially build some such as small mound, willow root heap (1.0 mg / kg potassium permanganate disinfection), in order to facilitate its hole, burrowing. A small amount of aquatic plants such as Hydrilla verticillata and Water Lilies can also be planted to provide stealth and reduce fighting between shells. To ensure that the crabs eat the right amount of bait, it will greatly reduce the likelihood of their residual food. The amount of intensive fish pond feeding should be based on the season, the water temperature and the amount of left and right bait after the first and second days of feeding. For example, in April-April, the water temperature is lower (8-15°C), and the small amount of fine material is the standard; from May to June, the temperature is getting higher, increasing the amount of bait, and emphasizing the plant feed, such as the green leaves, Water lettuce, etc.; from July to October, the water temperature is high, mainly animal feed; after November, the water temperature decreases, and the amount of feed is reduced as appropriate. Feeding should be fixed and timed, and it is appropriate to spend 3-5 p.m. every day in order to feed at night.
Third, the water body hypoxia
The best way to make the crab pool fresh and rich in oxygen is to change the water. Before changing water, it is necessary to strictly control the quality of water sources and prevent all kinds of polluted and inferior water from entering the pool. Before June, after October, the water temperature is lower, change the water once every 10 days, the amount should be small, about 1/4; July-September, the water temperature is high, change the water 1 time in 5 days, the amount should be large, about 1 /3. The activities of crabs are normal, and the amount of water exchanged is small, and vice versa.
Quicklime can kill bacteria, make the suspended organic matter in the pool cemented, and clarify the water in the pool. The increase of calcium ions in the water makes the sediment mineralized to release phosphorus, potassium and other ions. During the high-temperature season after July, crabs thrive, and these inorganic salt ions in the water are necessary for their oyster shells. In the months of July, August and September, half of the lime is spun once every 15-20 kilograms per acre. In the remaining months, once a month, the amount is slightly reduced.
Fourth, prevent disease, enemy
Before stocking, the crabs should be dredged and the sediment should be 20 cm thick. With water clearing pond, the water depth is 1 meter per acre, and 130-150 kg of quicklime slurry is evenly spread over the pool surface and the pool wall. The crabs entering the pool were bathed with 4% saline for 5 minutes, and the plants were soaked with 1 mg/kg potassium permanganate solution for 20-30 minutes. With 1 mg/kg oxytetracycline Quanchiposa, can prevent bacterial diseases; with 25 mg / kg of formalin Quanchiposa, can prevent parasitic diseases; with 0.1 mg / kg malachite green liquid The pool is spilled to prevent fungal diseases.
The main enemy of river crab is rats, frogs, otters and so on. When clearing the pool, the frog eggs, cockroaches, and otters in the pool are completely removed. The inlet should be filtered with a wire mesh wire mesh. The anti-escape wall around you must be strong and intact to prevent frogs from jumping in. Anti-escape wall placed outside the wall of rats such as zinc phosphide.
Tuna Loin,Frozen Tuna Loin,Fresh Tuna Loin,Yellowfin Tuna Loin
ZHEJIANG RETRONX FOODSTUFF INDUSTRY CO.,LTD , https://www.retronxfoods.com