Beware of White Spot Disease in Shrimp with La Niña's Return
Shrimp die from white spot disease
According to the National Center for Hydrometeorological Forecasting, the ENSO phenomenon is currently in a neutral state but gradually tilting towards a cold phase (with the sea surface temperature anomaly in the Nino 3.4 region 0.3°C below the multi-year average in early October 2024). Forecasts suggest ENSO might shift to a La Niña state between November 2024 and January 2025, with a 60-70% probability.
The anticipated arrival of La Niña at the end of this year has shrimp farmers and industry leaders on alert.
Dr. Ho Quoc Luc, Chairman of Sao Ta Foods JSC, explained that if La Niña occurs, temperatures will drop, creating favorable conditions for viruses that cause shrimp diseases, including the white spot virus. He recalled that when La Niña occurred in 2014, nighttime temperatures in the Mekong Delta dropped significantly, allowing the white spot virus to spread and decimate shrimp stocks. Farmers were forced to use chemicals to destroy infected shrimp, only resuming farming after extensive pond treatments.
With La Niña approaching once again, farmers are hesitant to begin new farming cycles. Dr. Luc emphasized the need to prepare a disease prevention plan in case of low temperatures caused by La Niña, which could reduce losses from white spot disease.
White spot remains the most damaging disease affecting farmed shrimp in 2024, according to Mr. Nguyen Van Long, Director of the Department of Animal Health. Over 1,400 hectares of shrimp farms have been impacted as of early October.
Shrimp farmers should select high-quality, disease-free shrimp seed from reputable suppliers
The Research Institute for Aquaculture II advises farmers to thoroughly prepare ponds before stocking, eliminating crustaceans that could carry pathogens. Using disease-free, high-quality shrimp seed from reputable suppliers is also essential.
Farmers should strictly enforce biosecurity protocols in shrimp farming areas, carefully manage water quality, use beneficial microbes, and boost shrimp immunity with supplements like Vitamin C, β-Glucan, and MOS (Mannan Oligosaccharides).
Seasonal timing is crucial for disease prevention. According to experienced farmers, shrimp stocked out-of-season are more susceptible to white spot disease. With the off-season farming period currently underway in southern provinces, shrimp are highly vulnerable to disease due to ongoing rains. Therefore, if farmers still plan to stock shrimp this quarter, they should wait until weather stabilizes, rainfall lessens, and temperatures become consistent, while strictly following preventive measures to mitigate the risks of white spot and other diseases.
Source: Vietnam Agriculture Newspaper
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Ngày đăng : 11/11/2024
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