Crab pond culture
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October 25 02:01:07, 2024
OF: Construction Tangjian Qing crab pool to select something, rectangular ponds, preferably soil with clay, clay loam, followed by sludge from the bottom layer is not more than 10 cm, area of ​​more than 10 acres, depth of 1 to 1.5 meters. Crab trenches around the crab pool, crab ditch 3 meters wide and 0.8 meters deep, more than 30 acres of the area to dig the word wells. Prepare before release (1) Disinfection at Clear Pond. Two weeks before stocking, 150kg of clear lime was used per acre. (2) Set water plants. Submerged plants and floating plants each account for one third of the total pond area. The submerged plant area is separated by mesh mesh to protect the aquatic plants from germination. (3) Add new water. Fill the filtered fresh water up to 60 cm deep the week before planting. (4) Put on snails. Before the Ching Ming Festival, 300 to 500 kg of live snails were released per mu. The species of crabs for stocking crabs should be 100 to 200 pieces per kilogram. The specifications are neat, the physique is robust, the crawling is agile, and the appendages are complete without damage and no parasites are attached. Precocious puberty crabs are strictly prohibited. 500 to 600 stocks per acre. Before stocking, the crabs were soaked in 3% to 4% saline for 3 to 5 minutes. The stocking ended at the end of March. The feeds for plant feed include bean cakes, peanut cakes, corn, wheat, sweet potatoes, potatoes, and various aquatic plants; animal feeds include small trash fish, snails, and river otters. Can also be fed pelleted feed. Feeding follows the principle of "four views and four decisions." (1) "Four sees" feeding. Look at the season: the proportion of animal feed and plant feed was 60:40 before mid-June, and from 45:55 late-June to mid-October: 65:35 from late June to mid-August. Look at the weather: sunny and more cast, less rainy days. Look at the water color: When the transparency is greater than 50 cm, cast more, and when less than 30 cm, cast less and change the water in time. Look at feeding activities: Finding that overnight feeds should be reduced, feeding should be increased during shelling. (2) "Four Ding" feeding. Timing: twice a day, 6 to 7 o'clock in the morning feeding, feeding 30%, feeding 4 to 5 o'clock in the evening, feeding 70%. Positioning: Spread along the shallow side of the pool in the shape of a “one†character, and set a feeding point every 20 cm. Quality: green, coarse, fine combination, to ensure fresh feed palatability, promote the vote with feed, full price pellet feed, is strictly prohibited cast corrupt spoilage feed. Quantitative: The amount of daily feed is determined to be about 1% of pond crab weight from March to April, 5% to 8% from May to July, and 10% from August to October. Water quality control The water level is maintained at 0.6 meters before the beginning of May, and the water level is maintained from 0.8 to 1 meter before the beginning of July. After the beginning of July, the water level is maintained at 1.5 meters. From June to September, change the water every 5 to 10 days. Change the water every two weeks in spring and autumn. Change the water every time by 20 to 30 centimeters. For every two weeks, use 10 to 15 kg of quicklime per acre to splash water once and adjust the pH value. Pool water transparency is controlled at 30 to 50 cm, and dissolved oxygen is maintained at 5 mg/l or more. The appropriate amount of feeding, to reduce the residual feed sink, regular use of bottom modifier (such as calcium peroxide, zeolite, photosynthetic bacteria, EM live bacteria, etc.); every two weeks selected sunny mechanically agitate the bottom once to promote pool mud Oxidation and decomposition of organic matter. Disease prevention and control adhere to the principle of "prevention as the main and treatment as the supplement." Prevent the following measures: (1) dry pond dredging and disinfection; (2) planting aquatic plants and stocking snails; (3) seed quarantine and disinfection; (4) regulating water quality and improving sediment quality. Treatment is mainly based on spilling, scientific diagnosis, and remedy for the disease. The use of toxic residual drugs is strictly prohibited. The daily management combined with the early and late feeding observation of crab shelling growth status, disease, predators, check whether the water source is contaminated. Check anti-escape facilities and promptly repair cracks. Fishing from October to November fishing, mainly to catch cages, light trapping, dry ponds and catching supplements.