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December 13, 2013


Daniel Gruenberg on GAA’s EMS Webinar


I think a lot of what was said in the webinar has to be taken with a grain of salt.  I think a lot of well-meaning people are trying to share their information with other farmers for all of our benefit, but since a lot of the farmers lack scientific training and a lot of scientists lack farm experience, there is a gap and false information is created.


As for the issue of whether EMS affects Penaeus monodon, just look at the experience in Vietnam, and you can see that while there may be isolated cases of P. monodon performing better in the face of EMS in very specific locations or rearing methods, the overall industry experience in Vietnam provides a lot of data to falsify that hypothesis.  Do we all have such short memories? In addition, laboratory experiences with experimental infection also show susceptibility of monodon and at my farm where we grow both monodon and vannamei, the monodon were the first to go.  Yes the pattern of disease is different because the farmer still gets some animals that seem to grow well, but he ends up with an economic disaster because many of his animals are stunted, exploding his feed conversion ratio with unsalable or low value animals.  Hardly what I would call a “tried and tested” alternative unless you have a stake in a company selling SPF monodon!


Same can be said for almost all the issues discussed in the webinar.  As for Dr. Chamberlain’s comment that animals can be moved from EMS areas to non-EMS areas as long as they come from fresh water is quite surprising to me, to say the least.  I personally do not think there is (or ever will be) enough scientific evidence to be able to make that statement.


Any scientists who believes the hypothesis that the Vibrio parahaemolyticus involved in EMS does not live in low salinity only needs to visit the numerous upstream farms in Southeastern China to see that it affects all salinities equally.


There is and sadly continues to be a lack of good science related to EMS, as well as a lot of bad science and perhaps even pseudo-science with an agenda.


Source: The Shrimp List (a mailing list for shrimp farmers).  Subject: EMS Webinar.  Daniel Gruenberg.  December 12, 2013.

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