Infectious Hematopoietic Necrosis Virus (IHNV) is a virus that primarily affects fish, particularly species like salmon and trout. It is a member of the Rhabdoviridae family and can cause severe disease in fish populations, leading to high mortality rates. The virus is transmitted through water and can spread rapidly in crowded aquaculture settings. IHNV causes symptoms such as lethargy, abnormal swimming behavior, and lesions on the body. Infected fish may also exhibit signs of hemorrhaging, particularly in the internal organs. Effective management practices, including biosecurity measures, are essential to prevent outbreaks in fish farms and natural water bodies.