infectious pancreatic necrosis
an acute disease affecting fry and young fish, originally seen in salmonids, but also affecting non-salmonids and shellfish, caused by the infectious pancreatic necrosis virus. It is characterized by darkened pigmentation, whirling about the long axis, and massive necrosis of the pancreas, pylorus, and anterior intestine, with the formation of a white exudate.

Medical dictionary. 2011.

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