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May 12, 2015


Can You Diagnose this Disease from the Pictures?


Juan Carlos Lehmann ( writes: In April 2015, we got postlarvae (Penaeus vannamei) from a local hatchery for stocking HDPE-lined, circular, freshwater, biofloc tanks in Veracruz, México.  At the hatchery, the postlarvae were acclimatized to 4% salinity.  Then we lowered the salinity to almost zero.


As the days went by, we realized the juveniles’ behavior wasn’t normal.  They looked weak and had black spots (necrosis maybe?) in their bodies and heads.  Mortality was high and by the end of the week, mortalities were almost 100%.


Under microscope, they had “spider-web” like patterns in the hepatopancreas and in the body and tail.  I’ve attached some pictures and would like your readers’ help in identifying the disease.






Source: Email to Shrimp News International.  Subject: Disease ID Help.  Juan Carlos Lehmann  (  May 10, 2015.

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