The crab is known as “Shuipin, soup and delicaciesâ€, which not only has delicious taste and bright color, but also has rich nutritional value and high medicinal value, and is well received by consumers. At present, the domestic and foreign markets are selling well and demand exceeds supply. In recent years, our coalition has selected river crabs as the first choice for structural adjustment of aquatic products. We have adopted a variety of feeding methods to make crab breeding a success. This has accelerated the structural adjustment of our country’s aquatic products, improved the output of water bodies, and increased the economic revenue of fisheries. Extremely important.
Here are some of the technical measures for crab farming:
First, build a good pond, do a good job of preventing escape facilities, do a good job disinfection
Crab ponds should be selected where there is sufficient water, good water quality, no pollution, and convenient drainage and irrigation. The intensive culture ponds are suitable for 1 to 10 mu, the water depth is about 1.5 meters, and the sediment is sandy loam, which is good for the growth of benthic animals and plants such as snails and aquatic plants. The bottom layer of mud cannot be too thick. Pond slope ratio 1:1.5-2. The pond is better away from the living area. The key to raising crabs in the pond is to do a good job in the construction of the facilities for the escape prevention of swimming pools. Anti-escape facilities have two functions: first, flood control in the flood season and prevention of crabs from escaping; second, it prevents the invasion of snakes and frogs. With the principle of lowering cost, facilitating maintenance, and smooth surface, we have chosen a double-film anti-escape facility. The film is 60 cm above the ground. The middle of the double-layer film is held up by cement boards or stakes and iron wire, which plays a fixed role. Some farmers use cement boards to prevent escape or bricklaying to prevent escape.
Before the crabs are stocked, the water should be drained first, and the bottom humus and excessive silt should be removed to eliminate the predators of river crabs such as black plucked turtles, clams, frogs and snakes. Before the crabs are released, the ponds must be cleared thoroughly with quicklime, with 75 to 100 kilograms of water per acre depending on the depth of the pool. Dissolve and spray the whole pool to kill bacteria, parasites, predators, etc., and increase pool water. The ph value increases the calcium ion content of the pool water, satisfies the crab shelling needs, and promotes growth and development. It can also be combined with application of organic fertilizer, which means that the quicklime is mixed with chicken manure and poured into the pool. In addition, natural enemies such as frogs, rats, and snakes must adopt a variety of methods such as removing rat poison and manpower from outside the pool to remove them as thoroughly as possible.
Second, transplant aquatic weeds to ensure that crabs have a stable ecological environment and increase the source of foodstuffs.
After the ponds are sterilized, the crabs are ready to cultivate aquatic plants before stocking. Transplanting plants grown in rivers in ponds is generally one-third of the pond area. By planting aquatic grasses, it is ensured that there is a stable ecological environment for the growth of crabs, providing habitats for crabs, hiding places for clam shells, and improving water quality and increasing the source of grass feed needed for crab growth.
Third, to launch healthy, high-quality young crabs
Pond cultivation of crabs, whether it is a single raise or crab fish polyculture, it is appropriate to put crabs, this crab grows fast, high survival rate, can be captured in the market. Generally about 2000 per acre. The stocking species is best known as Chinese mitten crabs. It grows faster, and most of the stocking crabs in the year amounted to more than 100 grams, which is in line with the market specifications. When crabs are first purchased, they must be selected by experienced chefs or professional technicians. To purchase one-year-old crabs, do not buy precocious crabs. Buy healthy and crawling crabs, and do not purchase them. Injury, sick crab.
IV. Strengthening feeding management and water quality management
1. Feeding
After stocking crabs, when the water temperature reaches above 11°C, it is necessary to start feeding. 3 to 4 months can be fed a small amount of paste-like food such as bean dregs, feed, etc., and can feed some of the more nutritious food such as fish, snail meat. From May to July, a large amount of plant material is mainly fed: aquatic plants, wood radishes, sweet potato slices, pumpkin slices, etc., and supplemented with animal feed, such as snail meat. After August, animal feeding was increased to meet the developmental needs of gonadal gonads, weight gain, and delicious meat. The daily feeding amount is generally 5% to 8% of the crab body weight. The food is generally served twice a day, once at 8 or 9 in the morning, and once again in the evening, mainly in the evening. In order to adhere to the principle of "observation and feeding", the feeding of crabs should be done in the same way as pond fish farming. It should be "four to four and four sets," that is, to look at the seasons, see the weather, see the water quality, see the activities of crabs, and regular and fixed points. , qualitative, quantitative feeding. Advocates collocation for feeding full-priced pellets.
2. Change water
The depth of the crab pool should gradually increase as the temperature of the water rises and the crab grows. The water depth in spring should be controlled at 0.8 to 1 meter, and the water depth in summer should be controlled between 1 and 1.2 meters; in autumn and winter, it should be increased to 1.2 meters or more. The pool water for crabs should be kept clean, cool and live. High dissolved oxygen is required and the ph value is maintained at 7-9. The advantages and disadvantages of changing water quality management work directly affect the yield and benefits of crab production. Therefore, it is usually necessary to pay attention to adding new or changing water to keep the water fresh. Crabs just entered the pool 2 days to 3 days try not to change the water (under normal water quality), wait until the big eye larvae become a period of larvae, and then change the amount of water, the general spring and autumn change every two weeks, 10 to 15 days in the summer to change the water, depending on the water quality of the water, in order to prevent disease and regulate the role of water quality. Where conditions permit, micro-fluid water can be used to raise crabs, so that the water quality is always fresh, transparent, and dissolved oxygen is sufficient.
3. Patrol Pool
Adhere to each patrol pool every morning and evening (not including feeding observation), mainly to see whether crab activities are normal, whether there is any change in water quality, whether there are loopholes in the escape and exit, especially in the rainy days, we must pay attention to observe and find problems in time to deal with .
Fifth, do a good job of prevention and treatment of diseases
During the aquaculture process, we insisted on the regular application of lime slurry to the whole pool. Feed regularly adding bait-repellent baits and regularly release disease-preventing drugs. The above measures ensure that each time the crabs are shelled, and effectively prevent the occurrence of crab disease. For ponds where crab disease occurs, it is necessary to prescribe the right medicines and take practical measures to ensure the success of breeding. Always visit the lake regularly to check whether there is any aging, rat hole, or human damage in the anti-escape facilities. Find problems and deal with them in time to prevent snakes and rats from invading and prevent crabs from escaping.
Sixth, timely arrest
In the frosty season, the massive crabs climbed out of the water and crawled on the surface of the water and on the banks of the pond. At this time crabs have generally reached the market specifications. In the evening, when the river crab climbs out of the water, it is used for fishing, catching and catching for several consecutive nights or longer, and the crab can be captured for more than 70%. The remaining "exhausted and crabs" drained the water for capture. From dangling crabs to getting crabs, you must catch the market in that year and capture them before the Spring Festival at the latest. Otherwise, missed capturing opportunities will cause unnecessary economic losses.
Here are some of the technical measures for crab farming:
First, build a good pond, do a good job of preventing escape facilities, do a good job disinfection
Crab ponds should be selected where there is sufficient water, good water quality, no pollution, and convenient drainage and irrigation. The intensive culture ponds are suitable for 1 to 10 mu, the water depth is about 1.5 meters, and the sediment is sandy loam, which is good for the growth of benthic animals and plants such as snails and aquatic plants. The bottom layer of mud cannot be too thick. Pond slope ratio 1:1.5-2. The pond is better away from the living area. The key to raising crabs in the pond is to do a good job in the construction of the facilities for the escape prevention of swimming pools. Anti-escape facilities have two functions: first, flood control in the flood season and prevention of crabs from escaping; second, it prevents the invasion of snakes and frogs. With the principle of lowering cost, facilitating maintenance, and smooth surface, we have chosen a double-film anti-escape facility. The film is 60 cm above the ground. The middle of the double-layer film is held up by cement boards or stakes and iron wire, which plays a fixed role. Some farmers use cement boards to prevent escape or bricklaying to prevent escape.
Before the crabs are stocked, the water should be drained first, and the bottom humus and excessive silt should be removed to eliminate the predators of river crabs such as black plucked turtles, clams, frogs and snakes. Before the crabs are released, the ponds must be cleared thoroughly with quicklime, with 75 to 100 kilograms of water per acre depending on the depth of the pool. Dissolve and spray the whole pool to kill bacteria, parasites, predators, etc., and increase pool water. The ph value increases the calcium ion content of the pool water, satisfies the crab shelling needs, and promotes growth and development. It can also be combined with application of organic fertilizer, which means that the quicklime is mixed with chicken manure and poured into the pool. In addition, natural enemies such as frogs, rats, and snakes must adopt a variety of methods such as removing rat poison and manpower from outside the pool to remove them as thoroughly as possible.
Second, transplant aquatic weeds to ensure that crabs have a stable ecological environment and increase the source of foodstuffs.
After the ponds are sterilized, the crabs are ready to cultivate aquatic plants before stocking. Transplanting plants grown in rivers in ponds is generally one-third of the pond area. By planting aquatic grasses, it is ensured that there is a stable ecological environment for the growth of crabs, providing habitats for crabs, hiding places for clam shells, and improving water quality and increasing the source of grass feed needed for crab growth.
Third, to launch healthy, high-quality young crabs
Pond cultivation of crabs, whether it is a single raise or crab fish polyculture, it is appropriate to put crabs, this crab grows fast, high survival rate, can be captured in the market. Generally about 2000 per acre. The stocking species is best known as Chinese mitten crabs. It grows faster, and most of the stocking crabs in the year amounted to more than 100 grams, which is in line with the market specifications. When crabs are first purchased, they must be selected by experienced chefs or professional technicians. To purchase one-year-old crabs, do not buy precocious crabs. Buy healthy and crawling crabs, and do not purchase them. Injury, sick crab.
IV. Strengthening feeding management and water quality management
1. Feeding
After stocking crabs, when the water temperature reaches above 11°C, it is necessary to start feeding. 3 to 4 months can be fed a small amount of paste-like food such as bean dregs, feed, etc., and can feed some of the more nutritious food such as fish, snail meat. From May to July, a large amount of plant material is mainly fed: aquatic plants, wood radishes, sweet potato slices, pumpkin slices, etc., and supplemented with animal feed, such as snail meat. After August, animal feeding was increased to meet the developmental needs of gonadal gonads, weight gain, and delicious meat. The daily feeding amount is generally 5% to 8% of the crab body weight. The food is generally served twice a day, once at 8 or 9 in the morning, and once again in the evening, mainly in the evening. In order to adhere to the principle of "observation and feeding", the feeding of crabs should be done in the same way as pond fish farming. It should be "four to four and four sets," that is, to look at the seasons, see the weather, see the water quality, see the activities of crabs, and regular and fixed points. , qualitative, quantitative feeding. Advocates collocation for feeding full-priced pellets.
2. Change water
The depth of the crab pool should gradually increase as the temperature of the water rises and the crab grows. The water depth in spring should be controlled at 0.8 to 1 meter, and the water depth in summer should be controlled between 1 and 1.2 meters; in autumn and winter, it should be increased to 1.2 meters or more. The pool water for crabs should be kept clean, cool and live. High dissolved oxygen is required and the ph value is maintained at 7-9. The advantages and disadvantages of changing water quality management work directly affect the yield and benefits of crab production. Therefore, it is usually necessary to pay attention to adding new or changing water to keep the water fresh. Crabs just entered the pool 2 days to 3 days try not to change the water (under normal water quality), wait until the big eye larvae become a period of larvae, and then change the amount of water, the general spring and autumn change every two weeks, 10 to 15 days in the summer to change the water, depending on the water quality of the water, in order to prevent disease and regulate the role of water quality. Where conditions permit, micro-fluid water can be used to raise crabs, so that the water quality is always fresh, transparent, and dissolved oxygen is sufficient.
3. Patrol Pool
Adhere to each patrol pool every morning and evening (not including feeding observation), mainly to see whether crab activities are normal, whether there is any change in water quality, whether there are loopholes in the escape and exit, especially in the rainy days, we must pay attention to observe and find problems in time to deal with .
Fifth, do a good job of prevention and treatment of diseases
During the aquaculture process, we insisted on the regular application of lime slurry to the whole pool. Feed regularly adding bait-repellent baits and regularly release disease-preventing drugs. The above measures ensure that each time the crabs are shelled, and effectively prevent the occurrence of crab disease. For ponds where crab disease occurs, it is necessary to prescribe the right medicines and take practical measures to ensure the success of breeding. Always visit the lake regularly to check whether there is any aging, rat hole, or human damage in the anti-escape facilities. Find problems and deal with them in time to prevent snakes and rats from invading and prevent crabs from escaping.
Sixth, timely arrest
In the frosty season, the massive crabs climbed out of the water and crawled on the surface of the water and on the banks of the pond. At this time crabs have generally reached the market specifications. In the evening, when the river crab climbs out of the water, it is used for fishing, catching and catching for several consecutive nights or longer, and the crab can be captured for more than 70%. The remaining "exhausted and crabs" drained the water for capture. From dangling crabs to getting crabs, you must catch the market in that year and capture them before the Spring Festival at the latest. Otherwise, missed capturing opportunities will cause unnecessary economic losses.
Dry Red Wine,Pure Taste Red Wine,Famous Red Wine,Dry Red Table Wine
Ningxia ZhaiXianSong Commercial and Trading Co.,Ltd. , http://www.nxupin.com