Attention should be paid to prevention and control of enteritis in eel culture in winter

In winter, water temperature drops, beneficial bacteria in water change, dissolved oxygen changes in water to eel survival caused adverse effects, resulting in eel physique decline, immune function decline, and eventually lead to enteritis, we must pay attention to prevention and control.

In winter, the temperature difference between day and night is large. some eel farms are eager to sell eels and often ignore the changes in the culture environment, including the drop in water temperature, changes in beneficial bacteria in water, changes in dissolved oxygen in water, and so on. These environmental changes adversely affect the survival of eel, resulting in decreased body constitution and immune function of eel, and finally lead to enteritis, the main symptoms of which are: anal redness, and most of the sick eel abdominal cavity has a lot of ascites. some eels have swollen and brown spleens, floating feces on the water surface, and white diarrhea in the water. Specific causes and treatment methods are as follows:

1. enteritis caused by temperature difference

some eel farms are eager for eels to grow up and desperately feed them, regardless of changes in the external natural environment. when cold air suddenly arrives, the water temperature drops sharply, and the temperature difference between day and night becomes larger, resulting in indigestion of eels and enteritis. The main symptoms are: intestinal congestion, floating stool on the water surface and pullorum. The specific processing methods are as follows:

1. External elimination

Chlorine dioxide 0.5-0.8 mg/L Disinfect once every two days.

2. Internal administration

Digestive drugs and 5 grams of salt, 5 grams of Chuanxinlian and 5 grams of Euphorbia humifusa per kilogram of material (after Chuanxinlian and Euphorbia humifusa are boiled, they are mixed with medicinal soup).

Second, enteritis caused by deterioration of water quality

With the increase of eel size and feeding amount, eel excreta also increased continuously, while the amount of water exchanged was still maintained on the basis of the original, and some fields were even less than the original due to lack of water, resulting in continuous accumulation of organic matter in the pool.

These organic matters rot and ferment in the pool, producing various harmful substances, resulting in various water quality indexes exceeding the standard in the pool, such as ammonia nitrogen and nitrite are high, especially nitrite is high, which is not only toxic, but also toxic and side effects on eels. In addition, a large amount of oxygen is consumed in the redox reaction to reduce to nitrate. Coupled with the large number of plankton in the water (such as: Chironomid larvae, cup worms, etc.), often resulting in a decrease in dissolved oxygen in the pool, some of the dissolved oxygen in the water is even as low as 3 mg/L. This can easily cause indigestion in eel. The main symptoms were as follows: eels swimming weakly, scattered, body surface mucus zebra-like; eels gathered together before and after the aerator and at the place where water was added; eels 'food intake decreased obviously, and some starved. The treatment method is as follows:

Stop eating 2-3 meals.

2, with nitrous acid can degrade nitrous acid (such as: nitrite quick kill 1-1.5 mg/L, Acer net 1-1.5 mg/L) adjust the water quality.

3, with potassium permanganate 3 mg/L +90% crystal trichlorfon 0.3-0.6 mg/L kill plankton, and increase dissolved oxygen in water.

4. After eel physique recovery, feed from low feeding rate and gradually increase feeding rate.

5. Oral administration: rhubarb soda tablets 8 tablets + berberine hydrochloride 5 g + malt 5 g + anti-inflammatory and cholagogue tablets 8 tablets (malt should be boiled and mixed with medicinal soup).