Anti-natural death Every year from September to November, a group of crabs from the yellow crab shelling green crab, into the final stages of life. Mature crabs have increased osmotic pressure in the body and cannot adapt to the low osmotic pressure environment of freshwater, resulting in a large number of dead crabs. For these crabs should be timely fishing for sale. There is a large temperature difference between day and night in the autumn of colds. Sometimes the temperature difference between day and night pools is as high as 10°C. The crabs die due to incompatibility. Prevention methods: (1) Adjust the water level and control the drastic changes in water temperature. The difference between the temperature of the injected new water and the old water should not exceed 3°C; (2) Keep more water hyacinth, water peanuts and other coverings on the water surface, but do not exceed the water surface of the whole pool. 1/2. (3) Deepen the water level to keep the water body temperature when the weather changes. Antidigestion Death Severe changes in the autumn pressure and water temperature often lead to changes in the diet of the crabs, which can easily lead to indigestion and even death in severe cases. Prevention methods: (1) Improve water quality and regularly disinfect with lime water. (2) Timely antibiotic prophylaxis in feed. (3) Do not feed or less feed plant-based feed, increase the amount of animal feed feed, such as eel, snail and so on. (4) Timely quantitative feeding, when the water temperature drops, the appropriate amount of feed is reduced.
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Prevention of Crab Death in Autumn
Autumn is the season of crab maturation and harvest, and it is also the peak period of crab death. Therefore, strengthening the autumn aquaculture management of river crabs is the key to prevent the autumn death of crabs and improve the efficiency of crab breeding.