Prevention and treatment of hemorrhagic edema disease of cultured Pelteobagrus fulvidraco

Hemorrhagic edema disease of Pelteobagrus fulvidraco is caused by bacterial infection. The disease is the most harmful during seedling or adult fish culture, especially in the process of seedling cultivation, with a mortality rate as high as 80%. In the hot season, the disease breaks out and spreads rapidly.

Symptoms of the diseased fish body surface yellowing, mucus increase; pharynx skin damage and congestion is a round hole; abdominal enlargement, anal swelling, valgus; head congestion, dorsal fin swelling, pectoral fin and ventral fin base congestion, festering, and even abdominal fin from pectoral fin to ventral fin longitudinal fissure, bile extravasation. There is a large amount of blood or yellow gel in the abdominal cavity, there is no food in the stomach and intestines, the stomach is pale, the intestines are full of yellow fluid, the liver is yellowish, the spleen is necrotic, and there are mildew black spots on the kidney.

Control and maintain good water quality, keep the content of dissolved oxygen in pond water above 5 mg / L, and appropriately reduce the stocking density of fish fry. After the occurrence of the disease, the water body was disinfected once a day for 3 consecutive days. At the same time, 0.6-0.7 grams of tetracycline was added to each kilogram of feed for bait feeding, once a day for 3 consecutive days; when feeding fish paste, 1% salt must be added to the feed.

In addition, when checking the symptoms of the fish, please be as detailed as possible, the symptoms from beginning to end, whether the activity is abnormal, eating, dissecting several diseased fish to see the visceral symptoms of the fish, etc., which is helpful to judge.