First, the construction of a pond to choose to shelter from the sun, the sun is sufficient, the pool is firm, pond slope flat pond, the best area of ​​3/15 to 1/3 hectare, can maintain more than 1 meter. In the pool of 30-50 cm above the water, anti-escape facilities shall be built. When constructing, first dig a circle of 30 cm deep narrow ditch around the pond, hit a pile 50 to 70 cm above the ditch every 1 to 1.5 meters in the ditch, and then surround the plastic film along the ditch. And nailed to the stake, fill in the soil in the ditch, bury the bottom edge of the film.
Second, add water to plant grass to build anti-escape facilities, disinfection and fertilization should first clear pond, inject new water, and then transplant plants into the pond, because the water plants are crabs inhabit, feed, hide, avoid the Department, to escape the enemy's place, so It must be rich and varied, and it requires the coverage of aquatic grasses to reach 1/3 or more. Water grass varieties can be used water hyacinth, wormwood and other emerged plants, or Vallisneria, submerged plants such as black leaf grass, or floating plants such as duckweed, the shore can also be grown vegetables and water peanuts. To move along the edge, fish that have not been removed should be removed as soon as possible to prevent rot from contaminating the water.
Thirdly, the stocking time for the stocking of crab seedlings is generally in May of each year. Since the crabs are cultivated (ie, the big-eyed larvae develop young crabs such as five-cent coins or button-sized juvenile crabs), precocious crabs (old crabs) are prone to appear. This stage of feeding and management is completely centered on preventing the appearance of old crabs.
Fourth, stocking densities should be large and small first, control the growth rate of young crabs, generally 1/15 hectare put 400,000 first, later gradually adjusted with the individual's growth, to IV larvae after going to 40,000.
Fifth, to ensure the best water quality to maintain micro-flow, the water should be clean, no pollution, transparency more than 40 cm, pH 7.5 ~ 8.5, dissolved oxygen is higher than 4 mg / cubic decimeter. If the water quality deteriorates, flush the water in a timely manner or open an aerator.
6. Cooling in summer is best to keep the pond water temperature at 18-23°C. The specific approach is: use groundwater, cold springs or bottom reservoir water as a source of water, diligently inject water; in the hot season, we must try to put shading on the grass above the crab pond.
Seventh, scientific feeding ponds to raise crabs to achieve "two fine, middle green." In spring and autumn, the weather is cool. At this time, feed more concentrate, mainly animal feed, supplemented with feed and vegetables. In summer, green feed is the mainstay. Feeding should not be too full to make it half-starved. V young crabs basically stopped feeding, allowing them to grow naturally, but also pay attention not to feed mildew feed.
VIII. Control of Moss Moss damage is mainly to inhibit the normal growth of aquatic plants. In severe cases, it will cover the aquatic plants, causing a large number of aquatic plants to die, seriously worsening water quality, and causing a large number of crabs to die. During the growth period of crabs, on the one hand, fertilizer and water can be properly cultivated to inhibit the growth of moss; on the other hand, copper sulfate can be properly used to kill the moss. Because copper sulfate is harmful to soft shell crabs, it should not be used before and after the crab shell phase. After the use of copper sulfate, a large amount of water must be changed so as not to affect the growth of aquatic plants. After the dry pond moss can be manually removed, and then completely clear the pond to kill the residual moss. In addition, when water is added to the crab pond, the water inlet is filtered with a stencil net, which can effectively prevent the moss from entering the crab pond.
9. Prevent disease as soon as possible Strengthen water quality management and regularly disinfect water bodies. Generally, once every 10 to 15 days, the whole pool is splashed with lime once, and 1/15 hectares of lime is used for 20 kg, which can sterilize and adjust the water quality of the pond. Try to use as little or no medication as possible and do not use drugs that have side effects on crabs.
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