Acute hepatopancreatic necrosis disease (AHPND) in
cultivated shrimps has been an increasing prevalence of vermiform,
gregarine-like bodies within the shrimp hepatopancreas (HP) and midgut.
WFS appears in shrimps from approximately 2 months of
culture onwards and caused by gregarines. The vermiform bodies formations are
consisting of Aggregated Transformed Microvilli (ATM). The ATM have originated
by sloughing from epithelial cells of the shrimp hepatopancreatic tubules. They
accumulate at the HP-midgut junction before being discharged within feces via
the midgut.
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