Crabs can grow through oyster shells, and their pods need to have three conditions: first, ecdysis, second, effective accumulation of temperature, and third, nutrient accumulation, and the three are unified to promote oyster shells. After decapitating and stocking the crabs, the first clamshell shells begin before and after Ching Ming. The successful implementation of clam shells will directly affect the survival rate and yield of crabs. Therefore, it is necessary to strengthen management before crab clams, and the following points should be specifically implemented: First, water quality regulation Water quality regulation mainly includes water level control and fatness control. The water level control mainly adjusts the water level according to the weather conditions, promotes the increase of water temperature, and reduces the stress response of crabs. Fertility control is mainly fertilizer and water. In the early stage, due to dry ponds, sun ponds, clear ponds, etc., the original algae species in the pond are basically killed. In addition, the water temperature is low and there are few new types of water algae, and it is easy to make water thin and difficult to fatten. The first phase of the fertilizer is to apply the base fertilizer according to the pond's fatness, the second is to supplement the beneficial algae in time, the third is to top-dress several times, and the fourth is to regularly supplement the water with carbon and minerals. Practice has proved that the water temperature of the fertilizer and water pond at the same water level is 1-2°C higher than that of the thin water pond, and the dissolved oxygen is sufficient to reduce the stress response of the river crab. Second, aquatic grass management In early spring, due to the slow effect of low-temperature fertilizer, water should be regularly spilled sodium humate to maintain a certain degree of fat and transparency of the pool water, and promote rooting and flourishing water plants. In the early stage, the main purpose of raising grass was to solidify roots and hair trees. When top dressing, it should be applied as far as possible to the roots so that the water plants can use the fat source well, the water grasses grow well, and the water quality is stable. Third, feeding management The crabs should be fed immediately after the pond and eat as soon as possible to restore the crab's physical fitness. At the same time, the digestive ability of the crab after the winter passed through the intestine is weak. In the early stage, some feeds with adequate nutrition and good palatability should be properly fed, and products that help to digest and protect the liver and pancreas should be mixed. The amount of feeding is not regulated. If the pool is to be raised in larger quantities, the amount of feeding should be increased. As long as the crabs are eaten, the pond must ensure that there is a supply of feed, so as to ensure that the crabs can smoothly peck the first shell. Fourth, disease prevention and control The diseases at this stage are mainly ciliates and mosses. The organic-rich crab ponds are prone to grow fiber caterpillars, and then disinfected and detoxified in good weather. The ponds that have grown into moss need to be treated in time. Excessive moss causes lack of nutrients in the water, which is not conducive to the growth of aquatic plants. Excessive fluctuations in the value of shrimp, crabs and shells. Raw Sunflower Seeds,Plain Sunflower Seeds,Unroasted Sunflower Seeds,Raw Sunflower Wuyuan county dafeng oil food co.,ltd , https://www.sundafengfoods.com