There are some little red dot on the scales of crucian carp raised in my fish pond. What is the cause and what kind of disease is it? What to pay attention to and how to solve it, please ask experts t

There are some little red dot on the scales of crucian carp raised in my fish pond. What is the cause and what kind of disease is it? What to pay attention to and how to solve it, please ask experts to answer. Bacterial hemorrhagic septicemia: This disease is also called fulminant infectious disease. Main symptoms: the head and body surface of the sick fish are congested or bleeding, and the muscles are also bleeding. It mainly harms freshwater fish such as silver carp, bighead carp, crucian carp and bream. The onset time is the whole production season, and the incidence rate is higher in high temperature season. It is the most serious epidemic that harms freshwater fish in China in recent years. Prevention method: 1. Remove silt and disinfect the pond with quicklime; 2. Strictly disinfect the fish before going to the pond to kill ectoparasites in time; 3. Replenish fresh water regularly and disinfect with quicklime water every 10- 15 days; 4. The tools used by sick fish should be strictly disinfected, and the dead fish should be buried deeply. The disease is a systemic disease, which should be treated both internally and externally. Chlorine dioxide for external use and Shen Xue for internal use.