Infectious Hematopoietic Necrosis Virus (IHNV) is a virus that primarily affects fish, particularly species like salmon and trout. It is known to cause significant disease in aquaculture, leading to high mortality rates in infected populations. The virus is highly contagious and can spread through water, equipment, and even by contact with infected fish. IHNV belongs to the family of viruses called Rhabdoviridae and is characterized by its rod-shaped structure. The disease it causes, known as Infectious Hematopoietic Necrosis, can result in symptoms such as lethargy, darkening of the skin, and swelling of the abdomen. Effective management and biosecurity measures are essential to control outbreaks in fish farms.