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Crabs fall into the autumn to prevent death
Every fall, the crabs have entered the season of maturation and harvest, and they have also entered the stage of death. If you do not pay attention to strengthening management, there may be significant losses due to batch death of crabs. How to prevent the autumn death of crabs? This is to proceed from the following three aspects: (1) Preventing natural death: As the saying goes: “Since the West Wind, crabs and feet itchâ€. From September to November each year, there are a number of crabs that have been growing for two years from the “Yellow Crabâ€. The shell becomes "green crab" and the gonad matures into the final period of life. All crabs with "foot itch" have been unable to adapt to the conditions of fresh water and low osmotic pressure due to maturation of the gonads and increased osmotic pressure in the body. Such crabs must escape to find a new environment, and eventually they will naturally die. These crabs should be arrested and sold in time to avoid losing their economic value due to natural death. (B) Prevention of indigestion death: After the fall, the temperature difference between day and night, pressure, water temperature changes will also increase, the crab's appetite will change, easily lead to indigestion and death. This is what is usually referred to as "expansion of the dead." In severe cases, it may lead to total death. Prevention methods include: improving water quality, regularly disinfecting with lime water; regularly adding antibiotics and auxin in food, not feeding or feeding plant foods; feeding should be done regularly and quantitatively. When the water temperature drops, the amount of feeding should be reduced accordingly. (C) Prevention of "cold" death: autumn, day and night temperature changes, the temperature difference is also large, and sometimes even a difference of 10 °C, crab is not adapted, easy to "cold" and cause breathing difficulties and death. Prevention methods are: pay attention to regulating the water level to prevent drastic changes in water temperature; the temperature difference when injecting new water should not be greater than 3°C; the water surface should be longer than some water hyacinths, water peanuts and other cover plants, but the coverage area can not be greater than 1/2 of the water surface; when the weather changes To deepen the water level.