I. Pond conditions Crab ponds should be sited with adequate water sources, convenient drainage and irrigation, and no water pollution. The size of the pond is adapted to the local conditions. It is rectangular in the east-west direction with a slope ratio of 1:3. The depth of the pool is about 2 meters. The water depth is 1 meter to 1.5 meters. The bottom of the pond has a well-shaped line, and the silt is shallow, and the plants are planted and the floating plants are transplanted. , Clear the pond 20 days before the seedlings are planted, use lime to spread 100 kg of pulp per acre (with water) evenly, and prevent aluminum from fleeing the board to form a 0.5-meter-high anti-escape facility. Second, the high standard of stocking patterns The crab culture has two ponds, male and female. The specifications range from 200 to 600 per kilogram, and the density ranges from 500 to 800 per mu. The time is one month before and after the Spring Festival each year. Third, the seed source, quality, stocking crab seed using the Yangtze River natural seedlings or natural seedlings cultivated by the Yangtze River, the quality requirements of disease-free, no injury, no precocious individuals. Before stocking, disinfect with 2% saline, then dip for 2 minutes in pond water and remove it for 2 minutes, and then refill it into water. Repeat this 3 times and finally stocking in the pond. IV. Water depth and water quality The water depth of the pond is controlled from 50 centimeters to 80 centimeters in the spring, 80 centimeters to 150 centimeters in the summer, 100 centimeters in the fall, and 150 centimeters in the winter. The water quality standards do not have any color, odor, or odor, and there must be no obvious oil film on the water surface. The pH should be maintained at 7 to 8, during the dissolved oxygen for 24 hours, the 16 hours must be greater than mg/L, the rest at any time not less than 3 mg/L, and the transparency at about 30 cm. V. Feeding methods Crab feeding is generally conducted twice a day, once in the morning and once in the evening, mainly in the evening, accounting for 0% of the day. The feeding method is based on “four sets of fourâ€, mainly on the shore and The shallow water area is evenly fed and the feed is “two fine and middle greenâ€. From April onwards, animal feeds are mainly required, and vegetable feed is used. In the middle growth stage, vegetable feed and animal feed are supplemented. In the later period, more animal feed should be fed. The variety of feed should be varied and cannot be single. Sixth, the daily management patrol pool every day, in the morning to check whether there is residual bait, anti-escape facilities; night observation to understand the crab eating activities and whether there is predators, and found that the problem is resolved in time.
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