Pathology of Experimental Pancreas Disease in Freshwater Atlantic Salmon Parr

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Abstract
Parr of Atlantic salmon Salmo salar (mean weight, 25 49 g) were maintained in recirculated freshwater and injected intraperitoneally with one of four inocula. Inoculum 1 was prepared from tissue homogenates taken from Atlantic salmon smolts with acute-stage pancreas disease. Inoculum 2 was a 0.22-μm-filtered preparation of inoculum 1. Inoculum 3 was prepared from tissues harvested from Atlantic salmon parr 8 and 10 d after inoculation with inoculum 1. Inoculum 4 (negative control) was prepared from tissues from Atlantic salmon smolts from a farm with no previous history of pancreas disease. The sequential development of lesions is described up to 23 d postinoculation. Inocula 1–3 produced pancreatic and cardiac lesions similar to those previously described in Atlantic salmon with naturally occurring pancreas disease. Negative-control fish developed no lesions, This is the first description of cardiac lesions resulting from experimentally induced pancreas disease. The results support the theory th...

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