The three diseases of grass carp mainly refer to the three diseases of rotten gills, enteritis, and red skin. These three diseases are all explosive diseases of grass carp, and grass carp of various sizes may become ill, so these three diseases are also the top priority of prevention for Guangfa farmers. The following is to introduce the pathogenesis principles, diagnostic methods and prevention and control measures of these three diseases.
First, the gills, enteritis, and erythroderma pathogens are columnar fibrophilia, intestinal punctate aeromonas, and pseudomonas fluorescent, all of which belong to gram-negative bacteria.
Second, grass carp these three diseases are mainly meteors in April to October, of which April to June mainly damage 1-2 years old grass carp, August to October mainly damage the grass carp of that year. Generally, the epidemic begins at a water temperature of 18 °C, and the high incidence period is the epidemic at a water temperature of 5 °C-30 °C.
Third, the main symptoms of diseased fish are swimming alone, the head is black, the gill cover has translucent holes, the gills are swollen and engorged, and the rot has mud.
Fourth, prevention and control methods
1, do a good job in pond cleaning, adhere to a good feeding environment, do a good job of substrate improvement, use biological bottom modification products to reach Qingqing, and secondly, you can also release lime in the pond.
2. In the process of breeding, the method of external consumption and internal administration is used for preventive treatment. Every 15-20 days, povidone iodine is used for water disinfection, killing germs in the water body, mixing jun wuying in the feed, and feeding continuously once a day for 3-5 days, which can effectively kill the germs in the grass carp. After using povidone iodine disinfection, timely use water to clear and detoxify, and according to the actual situation, the use of bacteria and algae supplementation and other methods.