Histological Alterations in Gill, Liver and Kidney of Rainbow Trout Following Fungal Infection

Histomorphological changes were observed to assess the effect of fungus on gill, liver and kidney of Rainbow trout (Oncorhynchus mykiss). The most frequent histological changes detected in the gills included hypertrophy, hyperplasia and fusion of secondary lamellae. Other lesions found were vacuolization, blood congestion, and increased melano-macrophage (MM) in liver. Shrinkage of glomerulus, increased Bowmen's space, increased MM and hematopoietic tissue were observed in the kidney.