The Sha Tung Estate is a member of the genus Pelicans, Tanguidae and Shatang. It is a common small-scale economic fish in the middle and lower reaches of the Yangtze River. It is commonly known as the "tiger shark," and is most commonly found in river ditch and lakes. Because of its low muscle mass, high meat content and rich nutrition, it has become a common dish for ordinary residents. In 2010, our company carried out the culture experiment of crab ponds and ponds in Xucun, Shuiyang Town, and achieved remarkable results. 10 acres of crab ponds set a total of 3,000 ponds, 610 kg of commercial crabs and 153 kg of sand ponds. To achieve an increase of more than 20,000 yuan, and achieved good economic benefits. The technical points are now described as follows:
I. Pond conditions: Choose ponds with sufficient water, fresh water, and no pollution. It has an area of ​​10 mu and a water depth of 1.5m. The slope of the pond is complete, the slope ratio is 1:3, and the injection and drainage system is perfect. It is equipped with micro-aeration pipe facilities.
Second, the pond preparation: winter pool draining water, remove excess silt, so that the sludge to maintain about 10cm, Mu with lime 50kg ~ 100kg watered plasm after Quanchiposa, to thoroughly disinfect, remove the wild, and exposure 15 days to 20 Days, in order to achieve the purpose of oxidizing the underlying organic matter, removing harmful pathogens. After a week of disinfection, the clear pond is filled with water of 20cm to 30cm, planted with compound plants, ie, deep species of Elodea; planting rotunds of black algae and Vallisneria (about 3 acres in area) in the center of the pool, and additional fence facilities for water plants. The coverage rate reaches 60% to 70% before demolition. From March to April, after the water grass transplant is completed, 100 kg of fermented organic fertilizer or bio-organic fertilizer is used per mu, and after half a month, 50 kg of nitrogen and phosphorus fertilizer is applied (depending on the water quality). This not only promotes the growth of aquatic plants but also inhibits mosses. The occurrence of this can also cultivate plankton in the pond.
Third, seed stocking: Before March 10, in the river crab holding area outside the fence, the acre has a size of 140 to about 800 crabs, and 800 to 800 pigs in the enclosure. Grass shrimp is used as a live bait for seedlings of small sand ponds. In May, about 2 centimeters per acre were put into the shatang seedlings.
IV. Breeding management
1. Aquatic grass management: The management of aquatic plants is the key to the technology of crab ponds and sand ponds. Because crabs like to eat the root of Vallisneria, it should be used to increase the amount of bait feeding method to protect, should be timely removal of the bitter grass destroyed by the river crab to prevent rotting water quality. Elodea is prone to overgrowth and pond closure, so it should be used during the hot season (July or so) to cut the upper half of Elodea with a dragging knife. It sinks about 20cm underwater. In order to increase the amount of water in the water, promote the photosynthesis of aquatic plants.
2. Feeding: In the early stages, fertilization can be used to cultivate zooplankton such as rotifers, cladoceros, and copepods in the water body, providing open bait for the newly hatched sand pond seedlings. In the later period, because there was a small grass shrimp that was put into the early stage, the small grass shrimp can also reproduce itself. Therefore, there is a constant supply of palatable bait for the growth of the sand pond in the later period.
3. Water quality regulation: The filter-feeding snail is not only a high-quality live bait of river crab, but also can purify the pond water quality and improve the transparency of the water body. Therefore, while doing a good job of water grass management, 500 kg of snails were put into every acre in June to better stabilize the water quality. As the temperature continues to rise, the water level is constantly raised, and an injection of water from 7 days to 10 days is performed once every 10cm to 20cm. The pond water level in the high-temperature period is maintained at about l.5m. In order to maintain good water quality in the ponds, from May to September, the Mu-substrate improver 2kg or mu with EM bacteria source dew 500mL, poured water poured Quanchipu, and alternately used, the amount, time depending on the water quality conditions can be adjusted. When splashing, turn on the microporous aeration facility in time.
4. Pest control: Pest control is mainly based on river crabs, and “control and prevention†measures are adopted throughout the year. "Defense": In the first month of May, 200 grams of mussels were netted and disinfected once, and 2% of Chinese herbal medicine and 1% of bacillus nets were taken orally, and they were fed for 3 days to 5 days. "Control": After the end of the Meiyu period, Mu permeates 200ml of 1% iodine into the whole pool and takes 2% of Chinese herbal medicine and 1% of neomycin sulfate as the bait, and feeds it for 5 days to 7 days. . "Protection": The disinfection of water bodies is carried out according to the drug withdrawal period, ensuring the health of the crab market. Due to the implementation of the "control and prevention and control" pest control measures, no pests or diseases have occurred during the cultivation of crabs and sand ponds.
5. Day-to-day management: Adhere to the patrol ponds every morning and evening to observe changes in pond water quality, growth of aquatic weeds, and feeding and activities of river crabs and sand ponds. Note that oxygen and drainage are required after heavy rain, and check that the anti-escape facilities in the pond are intact. To prevent crabs from fleeing. In the harvest season, anti-theft work needs to be done.
6. Fish crabs will be listed first around October. Sand pond fish is a low-temperature fish, after the end of the crab fishing. The net can be used to catch sand ponds by means of cutting under water grass or catching with dry ponds.Sodium Erythorbate,Sodium Erythorbate Powder,Food Additives Sodium Erythorbate,Antioxidant Sodium Erythorbate
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