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The survival rate of large-sized shrimp is only 50%! Shrimp disease EHP and WFD infest India, Indonesia and Thailand on a large scale! 60% infection rate!

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Introduction: Shrimp intestinal microsporidiosis (EHP) and white stool (WFD) have invaded shrimp farming areas in India, Indonesia and Thailand. The survival rate of large-sized shrimps is only 50%, and the output has been hit hard.


This year, due to the spread of shrimp intestinal microsporidiosis (EHP) and white stool disease (WFD) in India, Indonesia and Thailand, the harvest of white shrimp in the three places has been significantly reduced, and the harvest size is generally small.


According to Loc Tran, director of the Vietnam Shrimp Veterinary Laboratory, these two diseases are relatively common diseases in the process of shrimp farming, and they are also diseases with greater impact. What is more troublesome this year is the simultaneous spread of the two diseases. Combined with the simultaneous disease, the shrimp died in a large area.


"So far, we can conclude that if shrimp are infected with EHP first, they will be more likely to develop WFD, because EHP infection will damage the liver and pancreas and will be more susceptible to other bacterial infections, which also leads to simultaneous infections of the same shrimp. The two diseases have erupted on a large scale, and it is possible to solve the single disease itself, but if the two diseases occur at the same time, treatment is impossible.


Both of these diseases are the bane of the reduction in the shrimp farming industry in Asia this year, which has greatly reduced the shrimp maturity rate and also caused many shrimp farmers to increase the cost of feed farming.

Industry insiders from India, Indonesia and Thailand all pointed out that at present, this situation has not been effectively controlled. The death rate of shrimp related to this pair of diseases is increasing at an annual rate of 5-10%, and it will be particularly serious in 2020.


India: According to Ravikumar Bangarusamy, technical general manager of the Indian company, 60% of farms in India have been affected by this shrimp disease. Since 2014, shrimp production in India has been affected by WFD. The probability of WFD appears to be 10% every year. -15% growth.


"Every year, we generally maintain or even increase the stocking rate of shrimp larvae, but we will find that the maturity rate of seedlings has decreased, and it is declining year by year. Initially, farmers thought that it might be affected by higher stocking densities, but then discovered that no matter what Regardless of the density, the rate of shrimp disease outbreaks is rising, and this year has reached a historical peak.


Thailand: Novozymes, a shrimp farming expert at the Thai Biotechnology branch, added that not only are there more cases of WFD, but their onset time has also advanced. In the past, white stool may be found after 60 days or 70 days of shrimp growth, but it is often found in shrimps grown for about 35 days.


Indonesia: The Haris Muhtadi Association (GPMT), chairman of the aquafeed department of a feed processing plant in Indonesia, pointed out that for shrimp farmers in the country, WFD has a more serious problem than the past white spot disease. In addition, they also face the existence of diseases such as infectious myocardial necrosis virus (IMNV). Indonesian shrimp farmers are currently facing a very big dilemma.


Shrimp viability is reduced and mortality is increased! The scale of breeding is also shrinking

India: Data from 800 shrimp farms in India provided by Ravikumar, technical general manager of the Indian company, shows that when shrimps grow to more than 100 per kilogram, their viability begins to decline. In ponds affected by WFD, the average survival rate of 100 shrimps per kilogram in India this year is about 87%, while the survival rate of 30 large-size shrimps per kilogram is only 50%. This is 20-30% lower than the viability of an unaffected pond.


Under normal circumstances, shrimp will be infected with WFD in about 50-60 days, so there may be a period of sudden decline in mortality during this period. But when it grows to about 100 per kilogram, the slow death will occur and it is easy to be ignored.


He pointed out that production costs have also been similarly affected. The average cost per kilogram of 30 shrimp in shrimp ponds not infected by WFD is about $3.95, and the cost per kilogram of shrimp in affected shrimp ponds is $4.63.





In this case, the farmer's investment in shrimp seedlings is significantly reduced, because they may not have a high harvest while paying labor and costs, and even bear losses.

Thailand: Panakorn, a shrimp farming expert at the Thai Biotechnology branch, said after talking to about 20 farmers that the survival rate seems to be greatly reduced from the traditional 70-80%, and in the worst case, it is only 30%. We have seen a significant increase in WFD infections this year, especially during the rainy season, which has doubled from the previous year.


In addition, due to poor breeding conditions in Thailand this year, Thai farmers are also reducing the number of stocks and breeding density. "Let some ponds rest for a while." Panakorn said that the current price of shrimp is not very satisfactory.

Indonesia: Muhtadi, chairman of the aquafeed department of the Indonesian feed processing plant, said that similarly, the average survival rate in Indonesia has dropped from 70% in the past to 50%. Due to this huge potential loss, farmers in these three countries are suffering huge losses. As for the losses, the farmers have also dropped a lot, and some have reduced the scale of farming.


Solving the threat of industry WFD has become the primary problem

The WFD shrimp disease problem has severely affected the shrimp production in Asia and even the world. How to effectively control it has become the top issue for everyone.


Vietnamese expert Loc Tran proposed a method. He said: In Vietnam, we know that the pressure of shrimp diseases is very high. We have added more investment in the design of shrimp breeding environment. By dividing four production stages, Grow under different breeding densities. We found that this can reduce the infection rate of shrimp diseases.


He also said:The condition of WFD can be improved through the regular application of fermented probiotics every three days. Since we did this, our shrimp disease control is in good condition.