Autumn is both a harvest season for crabs and a season in which crabs can easily die. The causes of death are roughly the following: 1. Natural death. Crab sexual maturity often occurs from September to November each year. The body's osmotic pressure rises, and it cannot adapt to a freshwater, low osmotic pressure environment. It will naturally die or flee. 2, died of illness. In autumn, the water temperature changes greatly. When the temperature difference is above 10°C, the crabs are difficult to adapt and are susceptible to death. 3, bulging. Autumn crabs often suffer from changes in appetite due to changes in air pressure and water temperature, and can easily die indigestion.
For the above reasons, the following preventive measures can be taken: 1. The crabs that have been raised for 2 years must be picked up for sale in time to avoid old age. 2, adjust the water quality, control the water temperature. When the new water is normally injected, the temperature difference between the water temperature and the pool water cannot exceed 3°C. Transfer water hyacinth, water peanuts and other coverings on the water, and control the area within 1/2 of the water surface. 3. Regularly add antibiotics and auxin in the bait; do not feed or less feed the plant bait; feed animal feeds such as cockroaches and snails, and reduce the amount of feed after the water temperature drops. Every 20 days or so, the lime pond was disinfected once with lime, and 20 kg of lime was used for each acre.
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