Raising crabs should pay attention to changes in water temperature
When the water temperature changes drastically, the crabs will have a stress response and are prone to cause diseases. For example, when the water temperature suddenly changes, the muscles of the crabs relax, the joints of the crabs become soft, and the joints become weak and even muscle necrosis. When the new water is added, if the temperature of the new water is more than 3°C lower than the pool water temperature, the crabs are susceptible to the cold and die. In hot season, if the water temperature below 50cm exceeds 28°C for a long time, the crab is easy to be precocious, and when the water temperature is lower than 10°C, the river crab will make a hole or drill into the silt to overwinter, affecting the trapping work of the crab. It can be seen that the growth activities of crabs are closely related to the water temperature, and changes in water temperature must not be ignored in the breeding process. So, how to control the change of water temperature in the process of raising crabs? The first is to transport crabs as far as possible to maintain the original temperature and reduce the temperature difference. If crab crabs are transported, the temperature difference should be less than 2 °C; transport crabs, the temperature difference should be less than 5 °C. The second is to plant aquatic plants in crab ponds. The planting area of ​​aquatic weeds accounts for 1/3 to 1/2 of the total pond area, so as to facilitate the reduction of the water body temperature in the summer and prevent crabs from becoming precocious. The third is to raise new water can not be too fast too fast. The temperature difference between the temperature of the new water and the original water temperature of the crab pond should not exceed 3°C. The fourth is to trap crabs at temperatures above 10°C. Prevent crabs from drilling or drilling into silt to overwinter, increasing the difficulty of trapping.
Interpretive Ecg Machine,Ecg Machine,Three Channel Ecg
Medsinglong Medical Equipment Co., Ltd. , http://www.gzultrasound.com