In July, the high temperature season approached. According to meteorological department forecasts, the average temperature of crab farming areas in Anhui, Hubei, and Hubei is approximately 30°C. High-temperature weather above 35°C will occur in mid-late and late mid-term, and monthly precipitation will be normal. Or more normal than normal, about 160 180mm (yearly 173.2mm). Crab aquaculture has been in a critical period. The adaptability of various biological factors in the water body to the environment is very different, the water environment changes rapidly, the growth conditions of various types of aquatic plants are also different, the speed of nutritive salt reaction is accelerated, and fish, shrimp and crab grow in crab ponds. Each has its own characteristics. Therefore, the management of crab ponds has new requirements and new features. First, bait feeding and water quality management To July, crab ponds generally have more than 70 pounds of crabs, shrimp, and fish ponds. Therefore, according to the bait feed rate of 8 10%, the amount of bait per mu should be 5 7 pounds. During the high temperature period, the composition of the bait was adjusted. The animal-based bait was mainly used in the early stage, and 50% of the animal and plant bait was changed. The bait feed should be observed at all times, and the bait should be put into the crab pool at about 4-6 hours. After eating, excessive feeding of food will lead to deterioration of water quality. If there are leftover bait, it should be analyzed whether the weather is the cause of the weather or the water quality. If the water is cloudy or the grass is heavily contaminated, the feed may be insufficient and the amount of feed should be increased. It is suggested that the feeding amount of small fish during the high temperature period should be controlled at about 3 pounds/mu, which will help improve the water environment. In July, the water quality of crab ponds should be controlled at an average water depth of 60cm or more. By the end of July, the water level should be increased to the highest level. Water quality should be adjusted in order to add water, and water should be added once every 3 to 3 days. The water quality should be kept cool and live. The transparency should be kept above 50cm. During the high temperature period, crab ponds often suffer from poor water quality, water stratification, deterioration of water quality in deep trenches, poor water quality in local bushes, and eutrophication of water bodies. Therefore, in addition to regular water and water changes, water quality should be maintained. Substrate improvers and microbial preparations, and can detoxify the water body, improve the bottom quality and water quality, use it once every 10 days or so, the environment of crab pond water is poor, and it is used once every 7 days. II. Pond Environment Improvement and Disease Prevention and Control In July, Vallisneria alterniflora, Hydrilla verticillata and Ceratophyllum albopictus were still in a vigorous growth stage, creating a good habitat for crab growth and oyster shells, and played an effective role in purifying water quality, cooling water bodies, and increasing dissolved oxygen in water bodies. The aquatic plants in the crab pool should be well protected. If it is found that the aquatic plants are heavily contaminated or the water is turbid, measures should be taken in time, such as putting in large quantities of high-quality snails, and feeding bait to prevent batting. In order to observe and diligently handle groundwater, we must remove the remaining floating plants in time, and gradually eliminate the Elodea that have not yet been removed at the bottom of the trenches to keep the crab ponds clean and hygienic, and prevent the plants from rotting and damaging the sediments and water quality. Caused deterioration of the pond environment. In terms of disease prevention and control, it is necessary to prevent disease and prevent disease. Dirt modifiers and microbial preparations should be used at the present stage. Microecological preparations should be used to multiply beneficial microorganisms in water bodies and become a dominant population in the microbial system of the aquaculture water environment. Through its metabolism, it can improve water quality and inhibit harmful bacteria. Reproduction reduces the incidence of disease. At the same time, it is now possible to add oral medicine and vitamins, minerals and other additives to the bait to improve the disease resistance of the crab. After the fourth oyster shell was basically completed, the mineral elements, nutrients, and vitamins in the pond were greatly absorbed and utilized by the crabs. In order to ensure the healthy growth of the crabs in the pond and ensure the smooth progress of the fifth oyster shell of the crabs, it is recommended that Farmers Quantang Sprinkled Hard Shell Po and Multi-dimensional Nutrient Additives 12 times, and some other early-stage insecticidal indiscriminate crab ponds can be selected by rain, and water temperature is not high, but crabs have no bulk casualties. One ciliate-killing drug and low-dose quicklime are splashed, lime splashing volume is controlled at 5 to 10 pounds per mu per meter of water depth, to ensure that there are not a large number of parasites on the surface of the crab and the water body in the hot season, and the water body is refreshed. The current disease prevention and control work should be combined. Feed optimization and feeding, environmental improvement and other work are carried out to effectively prevent diseases and healthily breed. taicang hexiang packaging material co.,ltd , https://www.medpackhexiang.com