Multiple causes of tilapia hepatobiliary syndrome
Streptococcal disease can cause tilapia hepatobiliary syndrome, but the emergence of hepatobiliary syndrome in fish may be caused by a variety of reasons, the following classification.
Streptococcal disease prevention
1. Vigorously promote the development of ecological farming and healthy breeding modes. Ponds that have been used for many years must be pushed over the bottom of the pond in order to oxidize harmful substances. When the fry is released, the density of the fish should be reasonable. It is recommended that the Jifu series should be put at 1200/mu to 1500/mu, and the Oni series should be put at 1200/mu to 1800/mu. Strengthen daily monitoring, regularly check the fish's activities, feeding, etc., and find that when suffering from streptococcus fish, timely prevention and treatment. The water quality should be maintained well, often changing the water and regularly disinfecting.
2. Found dead fish, first stop feeding feed, one or two days later: Oral: Vitamin C, mix 0.2g/kg feed ~0.3g/kg feed, 10% fluorobenzic mix 1g/kg feed, Or norfloxacin 1g/kg feed, continuous taking 5 days to 7 days, the better. At the same time, the water body should be disinfected, and 8% chlorine dioxide powder should be used to disinfect the water body, 2 mu/kg to 3 mu/kg, once a day for two consecutive times. When the water quality is poor, aerators or biological agents can be used to regulate the water quality and maintain good water quality.
Hepatobiliary syndrome prevention
1. Scientific management, reduce disease. Tilapia raisers can add some substances in the feed that can improve the immunity of tilapia, such as vitamin C, E and some immune-boosting substances, through the daily intake, absorption and utilization of fish. It can naturally and effectively improve the disease resistance of tilapia and reduce the occurrence of diseases. At the same time, in the tilapia breeding process, it is necessary to strengthen management, change water in a timely manner, rational feeding, reduce water pollution, regulate the water to reach the state of fertilizer, live, tender and cool, and achieve the effect of prevention. In the later stages of the cultivation, especially in the polyculture ponds, water quality was adjusted and the tilapia hepatobiliary burden was reduced by reducing the amount of feed and the control of feeding materials every 10 days.
2. Drug treatment. Chinese herbal medicine can be used as a combination of three yellow powders, vitamin C, Radix isatidis, Radix szechuanii, and Hedyotis diffusa. It is recommended that households mix 80 kg of feed with 0.5 kg of licorice, three yellow powders, and Banlangen mixed together. For 5 days to 7 days, tilapia with mild conditions will obviously improve. In the case of poor water quality, we must first control the material, and then carry out water purification, disinfection or detoxification treatment, and at the same time mix Chinese herbal medicine and oral administration, so that it can play a basic control effect.
3. In detoxification of fish ponds, alum and ferrous sulfate mixture can be used simultaneously, and the effect is obvious. In the operation of water disinfection, the effect of chlorine dioxide is obvious, and it can reduce the ammonia nitrogen and nitrite effect.
4. The author discovered in actual production that strengthening water quality management, paying attention to feeding control, and conducting herbal health care can effectively prevent hepatobiliary syndrome.
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