The crab breeding enters the key stage of the fourth shelling. Due to the plum rain season and the high summer season close to midsummer, crab management has high requirements and is difficult to manage. There must be no slackening of paralysis and the following aspects must be addressed: jobs. 1, feed the bait After the fourth clam shell, the food intake will increase, and the amount of feed should be adjusted in time. The amount of daily feed should generally be controlled at 8 to 12 inches of its storage pond volume. The feed is mainly focused on small fish and daily feeding. About 3 pounds per mu for small fish, and with the right amount of pellet feed, wheat, soybean meal, corn, soybeans, beans, etc., the proportion of animal feed should not be less than 60?. 2. Disease prevention and treatment Now in the rainy season, the weather is fickle, low pressure, high humidity, low light, perishable water on the top of Elodea and Vallisneria, widespread propagation of pathogenic bacteria, incomplete decomposition of organic matter, nitrite, vulcanization Hydrogen and other harmful substances cause deterioration of the ecological environment. Therefore, at present, it is a critical moment for the prevention and control of river crab diseases. Prevention and control work should be carried out in combination with feed feeding, water quality control, and the construction of water ecological environment in the breeding process. It is particularly important to conduct one sterilization after the fourth shell, especially after the third shell. Now it is also a period of good application of microbial preparations. It can be widely used and regularly used. It is generally used once every 7-10 days. It can not only regulate the water quality, but also maintain a good ecological environment for the water, and it can also achieve the effect of preventing diseases. 3, the creation of the environment All kinds of aquatic plants laid in the dry period of crab ponds are in a prosperous period. The water and grass maintenance work should be done well. Ponds with poor aquatic growth on the plate fields should be fertilized appropriately in the water grass area, and areas with insufficient water plants should be replanted or transplanted in time. We must strive to achieve a balance between water and grass in ponds, rational distribution, and a good ecological environment in the pond. In the ponds with black algae growing on the purse seine, if the purse seine has not been removed, the purse seine should be removed according to the growth condition of the aquatic plants; the Elodea deep in the sulcus should be partially cleared and transplanted to prevent the water from being damaged due to water rot in the high temperature season. disease. In the process of removing Elodea, it should be done a small number of times, and be removed at the same time to prevent the bottom of the pond from damaging the toxic material. For ponds that have not been refilled with screws, a batch of high-quality live snails can be put into the oyster shell. The amount of the snails can be determined depending on the volume of snail ponds. Generally, about 150 kg per mu can be allocated. 4, water quality management The quality of crab ponds should be kept fresh, live, tender and cool. The pond water level is generally required to reach a higher water level. A quick lime can be used to adjust the water quality before the oyster shell. The amount of quick lime should not be too high. The lime water per acre is required to use lime. About kg, moderately increase the calcium content in the water. Due to the high temperature and increased crab activity, the water in the pool may be cloudy due to insufficient feeding amount, poor water quality regulation, small space for water activity, and insufficiency of disinfection and sterilization. Therefore, appropriate measures should be taken according to the actual situation, such as adjustment of bait and species. Adjust the water quality, increase the water level, disinfection, use of microbial preparations and other appropriate measures to keep the pond water quality refreshing, lean water ponds should consider moderate fertilizer, pool water transparency maintained at about 50 cm, is conducive to the healthy growth of crabs. Robusta Coffee Beans,Robusta Green Bean,Robusta Green Coffee Beans,Raw Robusta Coffee Beans YUNNAN H.C.IMPORT & EXPORT CORP , https://www.hccoffeebean.com