Rice field crabs management focus
2940nm Er: YAG Fractional Laser Beauty Machine ,Scar Removal Laser,Beauty Equipment Lasy Science & Technology Co., Ltd. , http://www.ywelightmachine.com
The development of crab cultivation in rice fields is of great significance in adjusting the industrial structure of rural areas and increasing the income of farmers. Rice field crabs should strengthen the management of feeding and management, mainly including food feeding, water quality control, field inspections, disease prevention and control. The general requirement is strict, serious, scientific, and reasonable. 1 Feeding of diets The crabs are omnivorous aquatic animals, especially animal feeds. Therefore, we should adhere to the principle of feeding with meat and vegetables, and combining scientific and scientific methods, and implement scientific feeding so that crabs can eat well and promote growth. Specifically, you should master the following four aspects. 1.1 Grasp the characteristics of crab feeding habits and provide a source of food. Should take full advantage of the characteristics of food and miscellaneous gluttony, adhere to local conditions, a variety of channels to solve the source of bait, to meet the maximum demand for crab growth and fattening on the bait. 1 Botanical fodder mainly includes water grass, pumpkin, watermelon rind and bean cake, peanut cake, wheat, corn and sesame. Water grasses can be solved by transplanting, harvesting, etc. Pumpkins and various vegetables can be obtained through gully cultivation. Grain feeds can be planted or purchased on their own. 2 Animal foods mainly include small fish, shrimp, cocoon, frog meat, and internal organs of livestock and poultry. Practice has proved that feeding more animal foods is not only beneficial to the growth of crabs, but also increases the disease resistance of crabs. Solve the animal food, you can use the edge of the lake, the small fish near the beach to establish a fixed acquisition, storage, transportation channels; can also be linked to aquatic products processing plants, meat slaughter plants and other units to establish a fixed feeding relationship. 3Compatible pellet feed has various advantages such as comprehensive nutrition, strong palatability and easy use, and can be made into series feeds according to different growth stages of young crab, yellow crab and commercial crab. Therefore, using crab feed, has obvious effect of increasing production and income, and can be purchased and used directly. 1.2 Make full use of the advantages of resources such as light, heat, water, and gas in paddy fields, and do a good job in the cultivation and utilization of natural foods. You can use phytosanitary fertilizer, appropriate amount of fertilizer and other methods to cultivate zooplankton, benthic organisms and green grass buds. At the same time, in the period from May to July, 200--400 kg of snails should be added to each 667m2 of paddy field, or part of the fertilized squid and green eggs should be put in order to allow them to breed naturally and provide high-quality palatability for the crab species. Bait, more than one thing. 1,3 In accordance with the fishing season and different growth stages of crabs, do a good job of bait combinations. In April and May, when the crabs were newly reared, they should focus on small fish, shrimp or soybean cakes, wheat, corn and other concentrates, and adopt a small number of feeding methods. July-September is the peak season for crabs. It should be dominated by grasses, pumpkins, hawthorn and other green materials, with a moderate amount of animal feed. From mid-September to October, you should feed some small miscellaneous fish and snail shellfish meat to promote crab feeding and increase crab body weight. At the same time, it also created conditions for the storage, transportation, and improvement of the survival rate of crabs after fishing. 1.4 According to the rules of life of the river crabs, implement scientific feeding. The daily feeding amount of crabs gradually increases as the individual grows. When the crabs are in the commercial crab stage, the daily feeding amount is 5%--8% of the body weight of the crabs, and is adjusted according to the season, weather, water quality changes, and crab feeding activities. Feeding 2 times a day, and once in the evening, the general evening feeding should account for 600% - 70% of the entire day. 2 Water Quality Management The management of water quality in crabs and paddy fields must serve both the growth of crabs and the requirements for rice growth. Therefore, in the management of water quality, we must grasp the following three aspects. 2.1 Adjust the water level according to seasonal changes In April and May, to increase the water temperature, the water depth in the crab canal is usually maintained at 0.5-0.8m; during the rice planting in mid-June, the water level in the crab ditch can be increased to be equal to Daejeon. After the rice fields are planted and returned to the jointing stage in July, the water level in the ditch can be raised to 1.2m or more, and the depth of the field surface can be kept at a depth of 3 to 5cm to allow the crabs to enter the rice fields for food. After the jointing of rice in August, the water level can be referred to the maximum. The field surface maintains a depth of 1Ocm; before the rice is harvested in October, the water level is gradually lowered to the field and exposed, and rice is ready to be harvested. 2.2 Adjusting the water level according to the change of weather and water quality The growth requirement of the crabs is sufficient for the dissolved oxygen in the pool. In order to meet this requirement, we must insist on changing the water regularly. Usually from April to June, change the water every 10-15 days, change the water 1/5--1/4 each time; during the hot season of July-September, change the water 1--2 times per week. Change the water by 1/3 each time; in October, change the water once every 5 to 10 days and change the water every time by 1/4--1/3. Pingjin should also strengthen observations. If the water level is too shallow, add water in time. If the water quality is too strong, replace the fresh water. The time for changing the water is usually at 10-11 am. 2.3 Adjusting the water level according to the pest control requirements of the rice baking field The paddy field is required during the mid growth period. The method of light roasting is usually adopted, and the water level can be lowered to the surface to expose the water surface. The baking time is short, and the water is added to the original water level immediately after the baking. When it is necessary to spray insecticides during rice growth, fresh water should be replaced as needed after spraying. 3 The day-to-day management of crabs in rice fields requires strict and strict management. 3.1 Do a good job of transplanting aquatic plants In order to increase the paella's palatability of plant foods, provide a good habitat, clam shell place, put seedlings before transplanting, in crab ditch, holding tanks transplanting plants, the density of plants transplanted cloth Manchugou, holding pond area 1/2 - 2/3 is appropriate. If it is eaten by crabs, it should also be planted in time. 3.2 Establish a job management responsibility system, do a good job of flood prevention preparations, implement dedicated personnel on duty, adhere to a daily inspection of the field in the morning and evening, and find problems in a timely manner. Crab-remaining rice fields are generally located in low-lying areas of the water network, and in August and September, flood-waterlogging periods and typhoon seasons. Therefore, where conditions are met, a certain amount of flood prevention equipment must be provided, and field crickets and other anti-escape facilities should be well-prepared to prevent flooding and flooding. 4 Prevention of predators by pests The prevention and control of predators in river crab is an important part of the success of crab farming in rice fields. 4.1 Adhere to prevention as a priority, do a good job of disease prevention The main diseases of paddy field crabs include crustaceans, gastroenteritis, and diseases caused by parasites. Mainly controlled by drug prevention and treatment. From June to October, every 15 to 20 days, quicklime lO--15kg can be used for every 667m2 ring ditch, and the solution prepared by adding water to 20mg/kg is splashed once in the whole ditch, which not only plays the role of disinfection and prevention, but also Supplement the calcium needed for crab growth. It is necessary to add terramycin to the bait regularly, and use 8 pieces (0.25g/tablet) of oxytetracycline per kilogram of bait to control the crab disease. 4.2 The use of a variety of methods to eliminate the predators of hostile crabs are mainly water mice, water snakes, frogs, cockroaches, water birds, otters and some ferocious carnivorous fish. In addition to the maintenance of the crab ditch, temporary pond clearing pool disinfection, usually found that the enemy should be caught in time to clear the clearance, the inlet and outlet must also be sealed with a dense mesh network, and prevent entry of predators. 5 Crab fishing Crab fishing usually begins in mid-October. High temperatures may be postponed as appropriate, and low temperatures may also be advanced: The general principle is that it is advisable not to delay as soon as possible to prevent sudden cooling and freezing and to increase the difficulty of catching crabs, especially using paddy fields to cultivate crab species. The crab fishing method: First, in the crab ditch set cages, crab cages and other tools to capture. The second is to use the water during the day to drain at night and use the habit of migrating crabs to swim. The third method is to adopt the method of first adding water and then draining, and gradually introduce the crab species or merchandise crab into the holding tank for fishing. The fourth is to use the habit of crab crawling on the beach at night and capture it by hand. Combined use of the above methods, the catch rate can reach more than 95%.