Detailed Explanation of the Prevention and Control Methods for Common Diseases of Pomfret
Pomfret is a freshwater fish with relatively high economic value. In recent years, as market demand has continued to expand, its farming scale has also grown rapidly, but at the same time, diseases have been worsening. Diseases have kept the survival rate of pomfret farming low and have affected the development of the entire pomfret farming industry. Below, the editor brings you the prevention and control methods for several common diseases of pomfret during the farming process. Let's take a look.
1. Nervous necrosis virus
Nervous necrosis virus has a high incidence rate mainly during the fry stage. After infection, fry die extremely quickly, and deaths occur in large numbers. It is also highly contagious and difficult to control. When the disease occurs, the body surface of the fry turns black, and they sink to the bottom, while some also float on the water surface. When diseased fish are dissected, the spleen is found to be bright red, and in the later stage it becomes black and swollen. This disease is mainly caused by sudden environmental changes during transport and stocking.
Prevention and control methods: Before releasing the fry, it is best to go through a temporary holding period so that the fry gradually adapt to the new farming environment. During the temporary holding stage, the main focus is to strengthen the fry's constitution, which can reduce the chance of this disease occurring.
2. Enteritis
Enteritis is a bacterial disease, and the pathogen is Streptococcus. It is the most common disease in pomfret farming and also the cause of the most deaths during pomfret farming. Its main causes are overfeeding, which leads to indigestion, or feed that is too dry and too hard, which can also cause indigestion after pomfret eats it and lead to this disease. Typically, diseased fish show no obvious external characteristics, but when opened up, the intestinal wall is found to be congested, and the intestines contain purulent material.
Prevention and control methods: Feeding should be done at fixed times and in fixed amounts. When adding feed each day, follow the principle of adding more but feeding less, and it is not advisable to feed too much at one time to avoid indigestion. At the same time, the feed is best softened before feeding. When enteritis occurs, add 5 grams of Qiangkangsheng and 10 grams of Nuojunsu per kilogram of feed and feed it, and it can be cured in about 5-7 days.
3. Body rot disease
Body rot disease is also one of the common diseases of pomfret. The pathogen is Aeromonas hydrophila. After infection, small red spots begin to appear on the body surface. As the disease progresses, these small red spots ulcerate, and finally the ulcers merge to form large wounds. As the wounds enlarge, the fish's muscles become exposed, leading to death. When the body surface of the pathogen is damaged, the likelihood of this disease occurring is greater.
Prevention and control methods: Pay attention to farming density to avoid body surface injuries caused by fish swimming. After infection, add 10 grams of Yubingkang, 5 grams of Junsuke, and 10 grams of electrolytic vitamins per kilogram of feed and feed it for 5-7 consecutive days, and it can all be cured.
4. Ichthyophthiriasis
Ichthyophthirius is a parasitic disease. When it occurs, small white spots appear on the body surface of diseased fish, mucus increases, scales fall off, and appetite weakens or is completely lost. When the water temperature is higher, the white spots spread across the entire fish body extremely quickly. When Ichthyophthirius parasitizes the fish gills, it destroys the gill filaments of the pomfret, ultimately causing the diseased fish to die from difficulty breathing.
Prevention and control methods: When the disease occurs, remove the diseased fish and soak them in freshwater for 5-10 minutes to kill the parasitic Ichthyophthirius, or use trichlorfon and copper sulfate with the hanging bag method, once every two days, for 3-4 consecutive times, and it can be cured.
The above are the prevention and control methods for common diseases of pomfret. We hope it can help you. If you want to learn more about pomfret farming knowledge, please stay tuned to us.