First of all, pathogens: the pathogens of vibriosis are some species of vibrios, such as Vibrio anguillarum, Vibrio parahaemolyticus, Vibrio alginolyticus, Vibrio vulnificus and Vibrio harveyi. Gram negative bacteria.
Secondly, the epidemic situation: Vibrio is the dominant flora in the microbial flora of marine animals' body surface and digestive tract, and it is also widely distributed in coastal and estuary areas. It can cause many serious diseases of cultured fish, crustaceans and shellfish. For flounder, June-September is the peak period, and the peak period is when the water temperature 15 ~ 25℃. Although this disease will not lead to sudden mass death, the cumulative mortality rate is high, and it often causes infection of other diseases.
Third, symptoms of severe diseases: the symptoms and pathological changes of vibriosis are diverse, which are related to different kinds of pathogenic bacteria and different kinds of sick fish. Most of them are manifested as loss of appetite, swimming weakness, skin ulcer on the body surface, redness or bleeding of the head and trunk, partial scale shedding, rotten snout and fin membrane, intraocular bleeding, anal swelling, abdominal swelling and yellow mucus outflow. The intestinal turbidity of PARALICHTHYS olivaceus larvae is also caused by Vibrio, which is characterized by intestinal turbidity, atrophy and abdominal subsidence. Flounder, flounder, etc. It has been found that this is very harmful.
Finally, preventive measures: maintaining excellent water quality and breeding environment is the main measure to prevent the disease. Once vibrio infection occurs, sulfanilamide bait can be fed at a dose of 1 day, 200mg per kilogram of fish body weight, and it will be halved after the second day, and it will be fed continuously for 7 ~ 10 day. Oxytetracycline can also be fed at a dose of 70-80 mg/kg fish body weight every day for 5-7 days. While taking the bait orally, splash the pool water with chlorine dioxide disinfectant (usage and dosage are according to the product instructions), depending on the condition, l ~ 2 times a day.