How to raise crabs in hot season

Summer high temperature season, hot weather, high water temperature, this time crab breeding management should do a good job to have sufficient water grass, ensure fresh water quality, pay attention to bait quality and escape prevention and disease prevention four points, detailed introduction as follows.

There must be enough water plants

In summer, crab ponds should be stocked with aquatic plants such as water peanuts and duckweed, or planted with some reeds, Zizania latifolia and other aquatic plants to provide a cool habitat for crabs. Crab pond set up or planting water grass area generally accounts for about 30% of the entire pond area, too much should be harvested in time, too little should be supplemented in time. At the same time, rotten weeds should be removed in time to avoid spoiling water quality and breeding germs.

Keep the water fresh

Crab pool should be checked regularly water quality, frequent replacement of fresh water, timely fishing to remove food and dirt, keep the pool clean. Water depth must be maintained at least 1 meter to prevent hot water from burning crabs. Water change is generally carried out from evening to 10 a.m. the next day, changing water once every 3-5 days, about 5 cm deep each time. Water sources must be clean and pollution-free. During the molting period of river crab, calcium ion content of water body should be increased. Generally, 5-10 kg of quicklime should be used per mu of water surface. After water is dissolved, the whole pool should be sprinkled once every 15-20 days to facilitate the healthy growth of river crab.

Pay attention to food quality

River crab is omnivorous animals, meat and vegetables are eaten, and preference for animal feed, such as mussels, snails, small miscellaneous fish and shrimp. Generally, from May to August every year, live snails should be put into crab ponds, about 200 kg per mu, for crab feeding. In addition, in the high temperature period should be appropriate to increase the proportion of plant bait, such as put some crab like to eat duckweed, water grass and so on. Pond crab culture, generally feeding once a day, in the evening, to adapt to the crab day out of the habit. When feeding, feed should be fed at 1-2 meters offshore, feeding amount should be based on the day's water temperature, weather and the previous day after feeding crab feeding situation for the corresponding increase or decrease, to eat that night is appropriate.

Prevention of escape, pest and disease

Crab ponds must be inspected daily during high temperatures. Through the inspection of the pond, understand the feeding activities of river crabs, check the escape prevention facilities, and see if there are diseases and enemies. If there are traces of crab escape, it is necessary to plug the loopholes in the embankment in time, replace the damaged escape prevention facilities and the net cover of the inlet and outlet. In windy and rainstorm weather, we should pay more attention to escape prevention. Attention should be paid to prevent the invasion of enemies, timely killing crab pond water rats and other enemy organisms. Artificial culture of crab disease more, can be applied irregularly quicklime, chlorine dioxide, fiber insects and other drugs, prevention and control of crab bacterial diseases and ciliate disease.