I. Ponds and environmental conditions 1. The pond pond mouth area is generally 3 to 6 mu, and the perennial water level is 1.2 to 1.5 meters. The mud at the bottom of the pond does not exceed 20 cm. The ponds reconstructed in low-level fields can be dug into ring-shaped ditch, “10†shape, “well†shape or a combination of several forms. The depth of the ditch is more than 1 meter, and the water depth in the shallow water area is maintained at 30 cm or more. 2. Into the drainage system to support, while entering the water, the other side of the drainage. The water inlet is equipped with a 40-mesh sieve to prevent entry of predator organisms. The drain outlet is wrapped with a 20 mesh mesh to prevent the crabs from escaping. 3. Water planting aquatic crops, such as water peanuts, water hyacinths, water spinach, etc., covering 30 to 50% of the water surface. 4. Water environment conditions: Excellent water quality, no pollution, the oxygen capacity of the water should be kept above 4mg/1, the PH value between 6.8 and 8.7, the total ammonia nitrogen below 0.2mg/1, transparency More than 30 cm. 5. Anti-escape facilities: The use of calcium plastic plates, glass, aluminum foil, plastic film and other materials around Tongkou will set up anti-escape facilities 30 cm above the ground. You can also use the 20-mesh membrane to set up anti-escape facilities at a depth of about 30 cm above the pond, which is more than 50 cm above the water surface. The net mouth is covered with 20-30 cm wide plastic film or plastic plate. Second, the choice of big eye larvae (crab seedlings) 1. Select high-quality natural crab or artificial crabs in the Yangtze River water system, parents of artificial crabs should not be reused crabs formed by artificial crab seedlings to prevent trait degradation . 2. The selected quality standard is that whether natural crab or artificial crab seedlings should be large individuals, 141-160 thousand/kg, yellow-brown, shiny, swimming ability at room temperature observation, no disease, hand grabbed Dry water can quickly spread out. 3. The artificial breeding of crab seedlings desalination must reach five days and the salinity is less than three-thousandths. The natural salinity of crabs should be less than five-thousandths of a meter. 5. Cultivation of crabs 1. Cultivation of live bait: In the week before the crab ponds, the ponds should be filled with water for about 30 centimeters. Apply organic fertilizer and water, apply 700-1000 kilograms of pig dung per acre, or put 2 to 3 before planting. Days, with inorganic fertilizer fertilizer, 30-50 kg of ammonium bicarbonate per mu and 3 to 5 kg of urea, cultivated plankton as live bait. 2. The crab seedlings should be put in water and soaked thoroughly. 2 When the crabs are put in, they should not be too wet or too wet. After the crabs are dried, they do not stick together. 3 When transporting long distances, wrap them with wet sacks, towels, etc., and spray water in an appropriate amount to maintain a certain humidity. 4 The temperature difference during transportation cannot be greater than 3 degrees Celsius. If necessary, air-conditioned vehicles can be used for transportation. 3. The crab seedling stocking 1 seedling quantity: artificial crab seedlings 0.4 ~ 0.5 kg / acre, natural crab seedlings 0.3-0.4 kg / acre. 2 Time for release: Artificial crabs are generally stocked from April 15 to the end of May. Natural crabs are generally stocked from May 25 to June 20. 3 The temperature of crabs stocking is not less than 18 degrees Celsius, and the temperature difference is less than 3 degrees Celsius. At the same time, as far as possible to avoid the rain and cold weather release. 4 Soak the crab seedling box in the pool water two or three times. After 15 to 30 minutes, adjust the crab seedlings to the water temperature in the pool and then put them into the pond. 5Before May 10, since the water temperature is lower than 18 degrees Celsius, it is better to adopt high-density holding and increase the oxygen-intensifying measures. Generally take a pond to dig a small pool, pool depth of 50 to 80 cm, stocking density of 0.5-10,000 per cubic meter of water, overnight and rainy days covered plastic film insulation, with a small aerator for 24 hours Continuous oxygenation, water grass area accounts for about 50%. 4. Feeding of bait 1 From big-eyed larvae to first-stage juvenile crabs, feed mainly on bait cultured in ponds, supplemented with feeds such as chicken cake, fish paste, soymilk, and blood meal. 2 The feed should be filtered through a 40-mesh screen filter and splashed in the whole tank. 3 Before the first stage of larvae, the feeding method should be adhered to a small number of times, and the daily feeding amount should be 100-200% of the body weight. After the second stage crabs, the number of feedings was reduced to twice a day, the amount of feeding in the morning accounted for 30%, and the afternoon accounted for 70%, and the feeding amount should be adjusted in time according to the feeding conditions and weather changes. 4 When the temperature of the water reaches 18 degrees Celsius or above, after the crabs have been grown in the second and third phases, the aeration and aeration facility may be removed, the high water level may be slightly increased, and the crabs in the small pond may be moved to a large pond or allowed to swim by themselves. 6. Incubation of juvenile crabs 1. After 20 to 30 days of incubation, the big eye larvae enter the third stage of juvenile crab and gradually use plant-based feeds such as wheat flour, buoy grass, yew, pumpkin, and watermelon rind. Forage grass, etc., can also be used young crab pellet feed, feeding amount according to feeding conditions. 2. With the gradual increase of temperature, the water level keeps increasing and the water level in the hot season is controlled at 1.2 to 1.5 meters. 3. Keep the water fresh and change the water at the right time. 4. Adjust water quality and increase calcium ion in water. 5. Keep the water grass cover 30-50% of the surface of the water, but it should not be too thick and thick to ensure that there is enough light. It can also provide places for inhabiting, shelling and concealment of young crabs. At the same time, it is also a delicious plant for juvenile crabs. Feed, purification pond water quality. 6. The reared young crabs should be fed with the appropriate amount of wheat. Generally, from the end of August, gradually increase the amount of feed to 5 to 10% of the body weight. Wheat must first be soaked in water and freshly sprouted, and cooked well. After mid-September, appropriate animal feed can be fed. 7. When the water temperature drops below 15 degrees Celsius, the amount of feeding is gradually reduced. 8. In the case of good weather in winter, feed in small quantities during the day. VII. Disease Prevention and Control 1. Clearance pond 1 disinfection 25-30 days before the seedlings clear pond, with chlorine disinfectant to water, whole pond spilled and disinfected. 2 After 3-5 days, use 70-100 kg/mu of calcined pulp to splash the whole pond to kill wild fish, crayfish (crayfish), crabs, frogs, etc., kill pathogens and adjust PH. The value increases the calcium ion content and improves the sediment quality of the sludge. 2. Change the water frequently, splash it regularly with lime slurry, improve water quality, prevent water pollution, and disinfect and sterilize. 3. Clean up and repel snakes, mice, birds, frogs, and frog eggs in the pond in time. 4. Control of Crab Disease The following list of fish medicines and control methods are for reference only. 1 Prevention and treatment of trembling disease (shivering disease) of crabs: Add 1 kg of “Cang An No. 3†to 100 kg of feed, and make it into pellets for feeding, sooner or later, once for 7 days. 2 Control of Crab Parasite Parasites. The diseased crabs will be discarded and discarded, and then disinfected with 0.7 PPM copper sulfate and ferrous sulfate mixture (ratio 5:2). 3 ciliate parasite control, increase the amount of water, can also be used 0.4PPM malachite green Quanchiposa. 4 control of rotten limbs, with 0.5-1 PPM oxytetracycline or nitrofurazone Quanchiposa once a week, 2-3 times in a row. 5 Saprophytic control, use 0.25PPM malachite green Quanchiposa, can also be used 3 to 5% salt solution soak for 5-10 minutes. 6 prevention of edema disease, with 0.5-1.0PPM oxytetracycline or nitrofurazone Quanchiposa, can also be used per kg of crabs by 0.1-0.2 grams of oxytetracycline or erythromycin mixed feed, Every seven days is a course of treatment for 2 or 3 consecutive courses. 7 Control of brown spot (crustacean disease), with reference to the prevention and treatment of edema disease, can also be used for fish and shrimp safety, three generations of fish shrimp safety, crab An 2 and other drugs. 8 Prevention of black shank disease, soaking with 2PPM furazolidone solution for 2 to 3 minutes, 100 g of furazolidone per 100 kg of feed can also be used to feed granules. 9 The prevention and treatment of clam shell disease, often changing the water, keeping the water fresh, regularly splashing the whole pool with 15-20PPM lime slurry, or adding 2/1000 of shrimp and crab dehulling into pellet feed, once a day, Feed for 10 days. 5. To promote crab growth, prevent disease occurrence and improve water quality, photosynthetic bacteria (PSB) cultures can be applied. There are two ways to use it. One is to add 2% of the amount to the bait; the second is to splash the whole pond, the first splashing amount is 5PPM, splash again every 4-5 days, the dosage is 2PPM; also two methods can be used at the same time. use. VIII. Starting from catch 1. Usually the time for catching crabs is from mid-late October to the end of April in the following year. The water temperature is below 15 degrees Celsius, and it is not suitable for catching during the frozen period. 2. Method of catching 1 A method of catching in dry ponds: Dry the water in the pond, catch it by hand, and then fill it with water. After one or two days, put it in dry water and repeat it three or four times. 2 net fishing method: generally hand-operated net fishing. 3 The cage fishing method: In the pond before placing the cage 2-3 days, the water temperature below 8 degrees Celsius should not use this method. 4 Flushing Water: The water is allowed to dry first, and then the new water is injected. Under the stimulation of the temperature difference, the crab species can climb to the edge of the pond to catch and repeat three or four times.
Dried Fruits, Dried Fruit,Native Products,Fruit & Melon
Goji Berry, Goji Plants Co., Ltd. , http://www.nbredgoji.com