Bacterial enteritis

The pathogenic bacterial enteritis disease is also called rotten gut, acaridium gills. The pathogen is gut-form Aeromonas punctiformis. It is a conditional pathogenic bacteria and there are such bacteria in the intestinal tract of fish. However, in healthy fish, the bacteria are in a weak condition and do not cause disease. However, when the water environment is deteriorated, the dissolved oxygen is reduced, the feed is fed with deteriorating conditions, and the feeding is not regular or quantitative, the resistance of the fish body is reduced, and the pathogenic bacteria are discharged into the water body to pollute the water quality. Feeds are transmitted to other fish via the fish's beak. Therefore, these diseases may occur and develop throughout the breeding cycle.

The epidemic is beginning to prevail at temperatures above 18°C. The onset of the disease is usually March to October and June to July are high incidence periods. The disease mainly harms grass carp, herring, squid, squid, bigmouth ray, moon ray and California baboon. Both fingerlings and adult fish can be affected. Mortality is generally around 50%, and when severe, it is as high as 90%.

Symptoms The diseased fish is dark in color, with a particularly black head, isolated and outliers, unresponsiveness, loss of appetite, and often floating irritably on the surface of the pool. Heavily affected fish with enlarged abdomen, erythema often on both sides, there is a clear "flippery fins", anal swelling and prominent, was purple, light pressure on the abdomen with yellow mucus or pus and blood from the anus. Cut open the fish's abdomen, see the abdominal cavity effusion, inflammation of the intestinal wall, intestine was red or purple, especially in the posterior intestine, intestinal mucosal cells tend to ulcerated off, and blood mixed with blood from blood, stuffed in the intestine, intestinal intestine Food; The liver also has red spots and congestion.

Bacterial enteritis disease and grass carp enteritis type of bleeding are very similar symptoms, in the diagnosis should pay attention to distinguish carefully, the difference lies in: the biopsy of the former intestinal wall elasticity is poor, more intestinal mucus, and the latter intestinal wall elasticity Better, less mucous in the intestine cavity; microscopic observation, the former less red blood cells in the intestine, there are some necrotic epithelial cells, and the latter there are a large number of red blood cells in the intestinal lumen and into pieces of epithelial cells.

Prevention 1 Thorough clear pond disinfection, implementation of "four eliminations" (pond, fish species, feed, tools disinfection), "four settings" (timing, positioning, qualitative, quantitative feeding) and other preventive measures. 2 Control the feeding amount in the high temperature period, do not feed too much, do not vote on deteriorating feed. 3 In the epidemic season of fish diseases, Baiyue Xiaoji Bait is fed every 15 days. It is added according to 0.5% of the amount of feed. The daily dosage of the bait is 3% to 5% of the fish's body weight and it is fed for 3 days.

Treatment 1 water depth 1 meter, per 667 square meters with povidone iodine solution 120 ml or 100 grams to 150 grams of diarrhea on the water Quanchiposa, used for 2 days. 2 per cubic meter of water with 0.3 grams of bromochlorohydrin or 0.3 grams to 0.4 grams of rickets or 0.5 grams of chlorine dioxide on the water Quanchiposa. 3 Add 50 grams of fast-acting fungus per 100 grams of feed or 50 grams of allicin to feed every 50 kilograms of feed. Feed 3 days to 5 days, and add 0.5% of medium fish to enteritis or 0.1% of medium fish to feed. 0.2% of the immune polysaccharides were tested and fed for 5 days. 4 250 grams of garlic head per 50 kg of fish (mashed), add 200 grams of salt and mix in 10 kg of feed, and feed 3 days to 5 days. 5 For each 50 kg of fish, 0.5 kg of garlic head, Eriobotrya japonica, and Shichangpu are tossed into the feed and fed for 3 days. 6 For every 50 kg of fish, use 2.5 kg of fresh madder grass (250g to 300g of hay) and 1kg of ground grass (150g to 200g of hay), chop and add water, boil it for half an hour, take the juice or crush the hay and mix it in the feed. Hello, feed for 4 days. 7 For every 50 kg of fish, use 1 kg of fresh purslane or 250 g of dried purslane grass. Fresh grass boiled or juiced with hay or chopped into the feed and fed for 3 days to 4 days. 8 For every 50 kilograms of fish, use 1 kilogram of Senecio, 1 kilogram of Daqingye and 0.5 kilograms of ground razor clams. Mix the feed with Jianshui and feed them for 3 days. 9 For each 50 kg of fish, use 300 grams each of verbena and plantain, add water and boil for half an hour and then mix the rice bran. After cooling, knead into lumps and feed for 3 days to 5 days. 10 For each 50 kg of fish, 100 grams of dried ginger, 1.1 kg of garlic, 75 grams of earthworm, 300 grams of Haijinsha, and 300 grams of perilla were used. The medicines were combined and decocted and fed into the feed. They were fed for 5 days.

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