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June 17, 2013


Daniel Gruenberg on EMS


Daniel Gruenberg ( I can tell you in Thailand (This is going to be controversial again, but hey I’m used to a bit of controversy!), that the multiplication centers have for the most part thrown out their old breeders (or they mostly died as I reported previously) and imported fresh breeders from Hawaii.  As a result, we see fewer ponds succumbing to EMS.  Along with that reduction, however, we’ve noticed that EMS hits the ponds later in the cycle, mostly in the second month instead of the first.  Early in 2013, the number of ponds that were getting hit with EMS was 80%.  Now, fewer than 40% are getting hit and most of those hits come after 30 days of growout.


These observations have several logical consequences.  It is possible that we are seeing a change from vertical to horizontal transmission.  It is likely that the source of the EMS was the local hatcheries and multiplication centers, not from the fresh Hawaiian broodstock.


We are now preparing samples to send to Dr. Tim Flegel to confirm EMS in these “late EMS” ponds.


With the economic damage increasing daily from EMS, we will likely see more and more possible solutions coming down the pipeline.


Source: The Shrimp List (a mailing list for shrimp farmers).  Subject: Shrimp Bioflocs in Saudi Arabia.  June 15, 2013.



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