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Chen Guozhong's "Three High" Crab Technology
The river crab farmer Chen Guozhong in Shuibei Town, Jintan City, Jiangsu Province, under the guidance of the Municipal Aquatic Products Station, adhered to the “three high†farming strategy of “high-tech, high-input, and high-efficiency†and had achieved good results for several consecutive years. He contracted a total of 21 acres of land and excavated into two ponds, including 17 acres of crab ponds and 3 acres of crab breeding ponds. In 2002, 17 acres of crab ponds captured 1,725 ​​kilograms of crabs and an average yield of 101.5 kilograms, including 178 kilograms of male crabs weighing 200-250 grams, 76 kilograms of fish weighing 250 grams and 162 kilograms of female crabs weighing 150 grams. The Changzhou Xuantang Bridge Market was sold for an income of 121,000 yuan and the rate of arrest was 93%. The average selling price of each crab was 11.5 yuan. Coupled with the raising of green prawns, squid, and flower peony income of 5,100 yuan, minus the production cost of 31,500 yuan, and the benefit of 5,564 yuan. His main aquaculture experience is as follows: First, pay attention to the cultivation of resources Each year after the crab is captured, he promptly disinfects it with quick-lime clear ponds, where the sludge is cultivated again. After the disappearance of alkalinity, the grasses were released and 50 kg of Elodea per mus of pond, 300 kg of yellow grass and 750 kg of stocked snails were planted. After planting the snails, 25 kg of superphosphate was applied. In the early stage, the water level of the pond is controlled at about 50 cm, which promotes the growth of aquatic plants and the breeding of snails. Second, stocking of self-breeding crab species The cultivation of crab species has the characteristics of low production cost, less disease, and high rate of catch-up. Every year, Chen Guozhong purchases 2 kg of high-quality big-eyed larvae to cultivate crab species. By the end of February, 700 acres of tidy and orderly, Crab species with full appendage (size 100-200/kg). Third, the water quality and water level adjustment During crab breeding, adhere to the spring shallow, summer full, autumn appropriate method. That is, 0.5-0.6 meters in the early stage, 1.0-1.2 meters in the middle stage, and 0.8-1.0 meters in the later stage. Keep the pH of the water between 7.5-8.5 and dissolved oxygen above 5 mg/l. In addition to planting good aquatic plants and putting on snails, we must also pay attention to doing "three adjustments", that is, "adjusting new ones", often changing new water in hot seasons, and "reactivating" and applying calcium dihydrogen phosphate once every 15 to 20 days; "Tuning", timely use of biological agents based on water quality concentration. Fourth, rational feed feed adhere to the perennial feed pelleted feed, the normal ratio: fresh fish 12.5 kg, wheat flour 15 kg, 10 kg of broad beans, soybeans and soybean meal 12.5 kg, corn 7.5 kg, 1.5 kg of calcium dihydrogen phosphate, The small fish is first crushed and then mixed with other raw materials and processed into pellets. The pellet feed mixed with crushed small fish has strong adhesiveness, is not easily dissolved after feeding, has a high feed utilization rate, and can be thrown evenly at the whole pool when feeding, so that the crabs can be eaten as much as possible, and the sunny days can be grasped. Hey, feed properly on cloudy days and stop feeding on heavy rain days. From late April to early May, crabs were found to be herbivorous for a long time, and the amount of feeding was increased to ensure that there was a flourishing water and grass crossing during the hot season. A total of 3,500 kilograms of pelleted feed was administered throughout the year. Fifth, scientific sets of squid, shrimp, shrimp, winter, put snails, mu cultivated young shrimp 2.5-3.5 cm 7-8 kg of juvenile shrimp. From mid-April to late May, catching up and staying small will be listed in batches. At the beginning of June, there are 10 sets of squid per mu. At the end of the year, about 750 grams/tail of squid can be caught at 6-8, and only the prawn and squid can raise 250-300 yuan per mu. Sixthly, in a timely manner, disease prevention and control adhere to the principle of “prevention as the main and prevention as the most important thingâ€. Under the premise of focusing on biological and ecological prevention, we must effectively implement the “prevention, control, and security†disease prevention and control measures, that is, the first in April. The water temperature of the secondary clam shell is about 20°C, and the insecticide, disinfectant, and internal Chinese herbal medicine are thoroughly taken. With the onset of the hot season, if the previous insecticide is not complete, the ciliate must be supplemented and the crab disease should be controlled in combination with extermination and internal use in order to prevent the outbreak of crab disease in the hot season. In late August, to ensure the crab disease If it does not happen again, a pest killing, disinfection and internal medicine treatment process will also be required. This will effectively control the occurrence of diseases through integrated biological, ecological, and pharmaceutical control. Seven, timely market price at the right time to sell the sale of female crabs during the National Day, when the female crab has been plump, the price is good, after sale can reduce the density of pond crabs, and better promote the growth of male crabs. In mid-November, crabs are sold into the busy season. With the increase in export volume, large-size male crabs are sold for good benefits.