Bile Acids--The Prevention of WFS on Shrimp

1. The symptoms of WFS

Faeces show white color, sticky, easier to observe, but not easy to deal with. White WFS occurs, hepatopancreas swelling, intestinal swelling.

 

2. The reasons that cause the WFS.

A. Bacterial infection: the origin of bacterial infection shrimp is weak, the origin of physical weakness is a variety of stress, feeding antibiotics have effect, but the success rate is not high, which is WFS hard to treat.

B. Pond environment: deterioration of water quality conditions, drug toxins residues will increase the shrimp hepatopancreas burden.

C. The weather changes: long-term rainy days, will affect the feeding of shrimp, leftover feed will sink to the bottom of the fermentation decay, deterioration of water quality environment, increase shrimp hepatopancreas burden.

 

There are many reasons for shrimp WFS, so we want to solve the problem of shrimp WFS will start from the basics.

WFS in the multi-certification and investigation, the basic problem is the hepatopancreas problems, pathological tissue observation WFS is not food digestion after the feces. It is ductal epithelium, intestinal mucosal epithelium and proliferative cells.

 

3. The effective control of measures on WFS

A. To keep water fresh, improve water stability.

B. High quality feed, avoid shrimp feeding bait and deterioration of feed and suffering from enteritis.

C. Recommended rainy days appropriate feeding, to avoid the remaining food, control the occurrence of WFS.

 

4. Regular use (water, bottom) detoxification, anti-stress biological agents.

5. In the aquatic animal feed to add bile acid can improve the immunity of aquatic animals, detoxification, protection of the hepatopancreas, to prevent WFS.

Once the hepatopancreas problems, shrimp resistance decreased, a variety of diseases will occur. Therefore, the key to the prevention of WFS is to protect the hepatopancreas.

 

4. How to control of WFS by using bile acids

A. The addition of bile acids can promote the digestion and absorption of fat, improve the utilization of cholesterol and polyunsaturated fatty acids in shrimp, deoxycholic acid and ursodeoxycholic acid can reduce the toxic substances on hepatopancreas damage, in addition to Bile Acid can combine or break down intestinal endotoxin, prevent endotoxin through the intestinal mucosal barrier through the portal vein into the liver, reduce intestinal absorption of endotoxin, increase intestinal barrier effect, to prevent endotoxin into the intestine, hapetopancreas and the whole shrimp body.

B. On the other hand bile acid as an effective fungicide, inhibit intestinal bacterial over-proliferation, maintenance of intestinal micro-ecological environment: due to the bile acid surface activity, deoxycholic acid can destroy the bacterial cell membrane, the cells damage, and thus inhibit the growth of bacteria, and even cause bacterial cell death, thereby inhibiting intestinal bacterial overgrowth.

WFS phenomenon should always be the main prevention, once the hepatopancreas problems, a variety of diseases will occur. In the feed long-term addition of bile acids, protect the hepatopancreas, from the fundamental prevention of shrimp WFS.