Infectious Salmon Anaemia (ISA) is a viral disease that affects farmed salmon and other salmonid species. It is caused by the Infectious Salmon Anaemia Virus (ISAV), which can lead to severe health issues and high mortality rates in infected fish. The disease is characterized by symptoms such as anemia, swelling, and lesions on the body. ISA is primarily spread through direct contact between fish or contaminated water and equipment. It poses significant risks to the aquaculture industry, leading to economic losses and strict regulations to control outbreaks. Early detection and management are crucial for preventing the spread of this disease.