Abstract
This chapter presents a review on the current update on the clinical aspects, classification, characterization, diagnosis, economic importance, epidemiology, transmission, prevention and control of Infectious haematopoietic necrosis virus in salmon (Oncorhynchus), Atlantic salmon (Salmo salar), rainbow trout (Oncorhynchus mykiss) and other Salmonidae fishes. Recommendations for future studies were also discussed.