Renal histopathology of SAV infected Atlantic salmon fry.

H & E stained (A) trunk kidney; (B) head kidney of unchallenged fish with high number of melanomacrophages (white circles); (C) trunk and (D) head kidney of cohabitation fry, note depletion of melanomacrophages (white circles), clear, enlarged sinusoidal spaces (si) and relatively large parenchymal cells (thick arrow) compared to control fry.