"Black spot disease" on vannamei

Some other cases shrimp black spots are detected only when the harvest resulted in reduced commercial value.

 

"Black spot disease" occurs at different salinities from 5 ‰ to 20-25 ‰. The time period from the disease occurred 20 days old to 90 days of age, but is most concentrated in the period of 25-45 days old. Shrimp often incidence "black spot" on the transition high season, weather vagaries place lasts 5-10 days, or the water temperature above 29 degrees C for a long time. However, the shrimp can still get the disease throughout the year regardless of weather condition.

 

Observe shrimp diseases common clinical signs are as follows:

- Shrimp lethargy, decreased food or skip meals.

 

- Slow growth rate.

 

- On the body appear tiny dark spots or large black patches, carrying a dark or black, thin tail, there may be parts of such lesions and scaly tail wear beards, beards penguin ...

 

- For severe cases empty gut, liver, pancreas pale, shrimp body surface dark spots can be smelly.

 

See pictures, details on how to prevent disease of black spots on the white shrimp here: http://www.vinhthinhbiostadt.com/vi/thong-tin-ky-thuat/benh-dom-den-tren-tom- the-chan-page-95.html