What is the cause of the "nameless death" syndrome of bamboo tube fish in low temperature season?

In the low temperature season, the main symptoms of bamboo shellfish are acute congestion, sticky dirt and rotten body. Often the disease is concentrated, the onset is acute, the mortality rate is high, and even the whole army is wiped out. It has seriously damaged the development of bamboo shoot shell breeding industry and hit the confidence of farmers.

A survey found the main cause of death? 1 is a common bacterial disease in autumn (such as hemorrhagic disease caused by Aeromonas hydrophila). ), and this disease often has certain signs. The most common fish in bamboo shoot shell pond, crucian carp, big head bait fish and so on have sporadic deaths. Perhaps there are no obvious symptoms in appearance, only individual "protruding eyes" and red spots can be seen;

Second, secondary infection (such as water mold, carrion, etc. ) caused by mechanical damage and stress caused by crossing the pond, dividing the pond and handling. When the water temperature has dropped to about 23-25 degrees in autumn, the fish body is unwilling to "dive to the bottom" because of injury, and it is easy to be injured and frozen, resulting in bacterial sensation and sticky dirty hair.

3. Chronic skin ulcer syndrome caused by poor sediment management and deterioration of water quality has been delayed until now due to imperfect treatment.

Second, the first phenomenon suggested in the treatment plan. At ordinary times, Qin Ying will patrol the pond and observe it carefully. If sporadic fish are found dead, they should be checked in time. You can use "Yuxuekang" (benzalkonium bromide) to spray 1-2 mu. M 2 days per bottle, the effect is obvious. In addition, when buying feed larvae, pay attention to check whether the larvae are sick and do a good job of quarantine and disinfection.

The second phenomenon is that when dividing bamboo shellfish into tang qian, we must pay attention to observing whether the weather forecast encounters abnormal weather dynamics such as sultry typhoon and cold air, and make preparations for water quality cultivation such as detoxification and algae cultivation in ponds in advance. The principle is that the water that is "fat and alive" should not be too thin. Stress nursing of Tangqian bamboo shellfish is also a necessary link. It is suggested that 300 grams of ginger be sprinkled when pumping water or coming out of the cage, which will help to keep sticky and calm, so as to reduce stress syndrome caused by shock. The operation process should be "light, steady and fast", and fish should be caught with dry water and mud to minimize the damage caused by fish friction.