The ascites of bullfrog is generally divided into hemolytic ascites and non-hemolytic ascites according to symptoms. Hemolytic ascites is characterized by massive bleeding in the abdomen and severe swelling of important tissues and organs such as liver, kidney and spleen. Non-hemolytic ascites shows that there is no blood in the ascites, which is white or transparent, the liver is seriously yellow and oily, and the kidney is eroded.

Ascites caused by Aeromonas hydrophila, Acinetobacter rofei, Edwardsiella and other pathogenic bacteria are mostly hemolytic ascites, while non-hemolytic ascites is mostly caused by overnutrition and abnormal metabolism of bullfrog, and a large amount of fat is deposited in fat, resulting in nutritional metabolic disorder.

Reference of prevention and control scheme for bullfrog ascites

After detailed communication with Mr. Yang, the water quality in the disease pool is usually muddy, but the feeding situation is better than other pools, so it is fed more than other pools, and it rained twice in the past two days. Then this situation is likely to be caused by both the pathogen and the nutrient metabolism disorder, so we should not pay attention to the pathogen alone in daily prevention and control of ascites, but also to the nutrient metabolism of bullfrog.

1. Thoroughly disinfect tadpoles before going down to the pond

Use potassium permanganate/quicklime to spray them in the whole pond

2. Control the breeding density

Although the breeding density can directly calculate the breeding benefits, the premise of successful breeding is to successfully produce frogs. Excessive bullfrog breeding density corresponds to higher bait feeding and fecal production. Exceeding the water carrying capacity will aggravate the deterioration of water quality and the breeding of pathogenic bacteria.

3. Check the quality of feed

Everyone knows that when the weather is hot and humid, feed is prone to mildew and deterioration. In fact, there is water in the air. As long as the feed is exposed to the air, feed mildew will always exist. Therefore, we should choose high-quality feed, and secondly, we should not buy it in large quantities at one time, and we should use it up as soon as possible after opening the feed.

4. Controlling feed and promoting metabolism

Because the overnutrition and abnormal metabolism of bullfrog can cause non-pathogenic ascites, the feeding amount should be controlled in breeding, and bile acid should be mixed to regulate fat metabolism, reduce fat deposition in the liver and reduce the occurrence of non-pathogenic ascites.

5. Regulating water quality

Generally, bullfrog ponds have shallow water levels and poor water carrying capacity. Ammonia nitrogen and PH are unstable, and organic matter degrades slowly. Acinetobacter, Aeromonas hydrophila and other pathogens causing ascites widely exist in soil and water, and the pathogen density is higher in sewage with rich organic matter.

Therefore, we should maintain the steady balance of bacteria and algae in daily life, strengthen the frequency of changing the bottom, and disinfect the pool water regularly in summer and autumn when ascites is high.