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Shrimp farming : EMS Spreads to Central China

12 May 2014

In March 2014, white shrimp (Penaeus vannamei) began dying shortly after being stocked in shrimp ponds around Ningbo, a city in the central province of Zhejiang.

The Ningbo Ocean and Fishery Bureau recruited So Huang Jie, an expert in the prevention and treatment of shrimp diseases, to diagnose the problem.  Huang came to the conclusion that the mortalities were caused by EMS or Early Mortality Syndrome, which, previously, had not occurred that far north.  The disease struck ponds covered with greenhouses, causing great concern among other farmers getting ready to stock their outdoor ponds.  Seedstock, purchased in southern China, was suspected of carrying the disease to the ponds.  Recognized seedstock brands seemed to result in a much lower incidence of EMS than off-brands.  Polyculture of shrimp with fish or turtles decreased the incidence of EMS.


Shrimp farming is one of the most important aquaculture industries in Ningbo, generating revenues of $160 million from around 11 thousand hectares of ponds.  In 2013, Ningbo’s shrimp farmers produced 40,000 metric tons of shrimp, thanks to high temperature and the low disease rates, while, during the same period, southern China suffered great losses to EMS.


Huang said EMS also hit the northern provinces of Jiangsu and Shandong.



Source : - Editor and Publisher, John Sackton (phone 1-781-861-1441, email  EMS Spreads North in China, Impacting Ningbo, a New Farming Area South of Shanghai.  Translated by Any Zhong.  April 24, 2014.

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