Impact of Salmonid alphavirus infection in diploid and triploid Atlantic salmon (Salmo salar L.) fry
Fig 4
Histopathology of heart in SAV infected Atlantic salmon fry.
(A) Normal heart of diploid control fry; (B) Normal heart of diploid cohabitation fry showing cell infiltration in myocardium (thick arrow) and epicardium (thick arrow), increased serous fluid accumulation in the ventricle, and hyper-eosinophilia in the compact and spongy cardiomyocytes; (C) Triploid immersion fry: severe diffuse myocardial degeneration affecting spongy myocardium with hyper-esosinophilia and hyalinisation in myocyte; (D) High magnification view of diploid immersion heart. Inflammatory cell infiltrate within epicardium (EC), spongy myocardium (S) and at interface of the compact spongy myocardium (thick arrow), severe diffuse hyalinisation in compact myocardium (blue arrow), nuclear pyknosis and karyorrhexis.