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Faced with the spread of the disease, the breeding sector is changing its mindset, gradually evolving from early prevention and control to today's adaptation and coexistence
.
During the 2021 Aquaculture Roundtable, Ravikumar Bangarusamy, technical director of Indian feed producer Growel Feeds, stated that from 2021, 80% of Indian shrimp ponds will have EHP problems.
The problem was discovered in the pond 60 days later, when the white shrimp had grown to 7-8 grams
.
"
The problem was discovered in the pond 60 days later, when the white shrimp had grown to 7-8 grams
.
"
"Here, if 2-3 grams of small shrimp are infected with EHP, the growth rate is very slow, it is difficult to grow to the ideal market size, and the survival rate is less than 60%
.
We divide the severity of EHP into three levels, the most serious is every The weekly growth is less than 1 gram.
In this case, we generally recommend that the shrimp farmers directly harvest the shrimps and end the farming early, and there is no need to continue
.
If it is slightly relaxed, we recommend that they extend the farming cycle until the size of 15-20 grams
.
"Bangarusamy said
.
.
We divide the severity of EHP into three levels, the most serious is every The weekly growth is less than 1 gram.
In this case, we generally recommend that the shrimp farmers directly harvest the shrimps and end the farming early, and there is no need to continue
.
If it is slightly relaxed, we recommend that they extend the farming cycle until the size of 15-20 grams
.
"Bangarusamy said
.
picture
Loc Tran, director of the ShrimpVet Laboratory in Vietnam, said, “EHP is the biggest problem for the shrimp farming industry in Vietnam
.
Farmers and processing companies have learned profound lessons.
They know what they are facing and learn how to deal with them.
Diseases coexist
.
"
.
Farmers and processing companies have learned profound lessons.
They know what they are facing and learn how to deal with them.
Diseases coexist
.
"
EHP is different from EMS (Early Death Syndrome) and White Spot Syndrome.
It does not directly cause death, but greatly reduces the growth rate of white shrimp
.
If not detected in time, shrimp farmers may waste a lot of feed
.
It does not directly cause death, but greatly reduces the growth rate of white shrimp
.
If not detected in time, shrimp farmers may waste a lot of feed
.
The Vietnamese laboratory also found that shrimp ponds infected with EHP are more susceptible to outbreaks of Vibrio and white stool.
Once there is a history of EHP infection, it will be difficult to get rid of this problem in future farming
.
Once there is a history of EHP infection, it will be difficult to get rid of this problem in future farming
.
In Thailand, EHP is also a big problem
.
Kallaya Sritunyalucksana, director of Thailand's National Center for Genetic Engineering and Biotechnology, believes that EHP is not a pathogen that is difficult to deal with.
"Our research team found that the quality of water determines the incidence of EHP.
In a superior water environment, EHP is difficult to replicate and spread
.
"
.
Kallaya Sritunyalucksana, director of Thailand's National Center for Genetic Engineering and Biotechnology, believes that EHP is not a pathogen that is difficult to deal with.
"Our research team found that the quality of water determines the incidence of EHP.
In a superior water environment, EHP is difficult to replicate and spread
.
"
"EHP spreads to clean shrimp ponds through living creatures.
Our experiments have found that EHP spores are not difficult to kill.
If the temperature is above 75 degrees, the infectivity will disappear.
We have published two papers
.
" Kallaya Say
.
Our experiments have found that EHP spores are not difficult to kill.
If the temperature is above 75 degrees, the infectivity will disappear.
We have published two papers
.
" Kallaya Say
.
How to deal with EHP? Loc Tran suggested that the first priority is to use SPF+ to seed shrimp to ensure that the shrimp itself does not carry pathogens
.
Second, use film-covered shrimp ponds to prevent EHP spores from accumulating in the soil to infect the next crop
.
.
Second, use film-covered shrimp ponds to prevent EHP spores from accumulating in the soil to infect the next crop
.
In Vietnam, cement ponds and circular aquaculture ponds are becoming more and more popular.
An optimistic estimate is that 30-40% of Vietnamese shrimp ponds are covered with plastic film.
The aquaculture density has increased with technological innovation and the aquaculture mode has become more and more controllable
.
Tran said
.
An optimistic estimate is that 30-40% of Vietnamese shrimp ponds are covered with plastic film.
The aquaculture density has increased with technological innovation and the aquaculture mode has become more and more controllable
.
Tran said
.
