Control of common diseases of cultured Pelteobagrus fulvidraco

Hemorrhagic edema disease

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.

Enteritis disease

Pelteobagrus fulvidraco enteritis is caused by Aeromonas punctata infection. It mainly harms fish species and adults. The epidemic peak usually occurs when the water temperature is 25-30 ℃.

Symptoms of diseased fish abdominal enlargement, anal redness and swelling, light pressure on the abdomen, there is yellow mucus outflow from the anus. The slightly diseased fish esophagus and foregut are congested and inflamed. In severe cases, the whole intestine is inflamed with light red, and the blood pus is filled with the intestine. Sick fish swim alone from the group, slow activity and loss of appetite.

Prevent and cure thorough pond cleaning and disinfection; do not feed moldy and rotten feed, disinfect the live feed with 2%-3% salt solution, and regularly add 1% salt or 0.1% fresh garlic juice to the feed; sprinkle 0.5 grams of dibromohydantoin water in the whole pool per cubic meter of water; add 0.4 grams 0.5 grams of oxytetracycline powder per kilogram of feed for 5 consecutive days.

Rotifer disease

Pelteobagrus fulvidraco rotifer is caused by rotifer parasitism. It mainly harms the fry and fry of Pelteobagrus fulvidraco.

Symptoms of diseased fish restless, serious infection of diseased fish swimming along the pond edge, showing a "horse race" phenomenon; microscopic examination showed that a large number of rotifers parasitic on the fish Gill filaments and skin mucus.

Control every cubic meter of water with 0.7g cupric sulfate ferrous sulfate mixture (5 ∶ 2) to sprinkle the whole pool, or per mu of water with neem leaves 30kg frying and then sprinkling soup whole pool.

Cucumber disease

The small melon disease of Pelteobagrus fulvidraco is caused by the parasitism of many small melon insects. When the fish is overfed, insufficient feed and thin, the fish is easy to be infected by melon insects.

Small white spots can be seen on the body surface of symptomatic diseased fish, and in severe cases, the body surface seems to be covered with a white film; microscopic examination of Gill filaments and skin mucus shows a large number of small melon insects.

The fish were soaked in 50 mg / L formalin solution for 10 minutes for 15 minutes, and the infected fish ponds were disinfected with formalin. Every cubic meter of water was sprinkled with 2 grams of methylene blue water in the whole pond, once a day for several days.

Anchor head flea disease

Pelteobagrus fulvidraco anchor head flea disease is caused by anchor head flea parasitism. April to June is the popular season.

At the initial stage of the onset of symptoms, the diseased fish showed restlessness, slow swimming, weight loss and so on. The parasitic site is inflamed and swollen with erythema. The parasitism of anchor head fish fleas can be seen with the naked eye.

Control every cubic meter of water with 90% crystal trichlorfon 0.3-0.4 grams of water sprinkled in the whole pool.