Viral Hemorrhagic Septicemia (VHS) is a serious viral disease that primarily affects fish, particularly species like rainbow trout and yellow perch. It is caused by the Viral Hemorrhagic Septicemia Virus (VHSV), which can lead to severe internal bleeding and high mortality rates in infected populations. The virus is often spread through contaminated water or direct contact with infected fish. Symptoms of VHS include lethargy, darkening of the skin, and swelling around the eyes. Infected fish may also exhibit signs of hemorrhaging in their fins, gills, and body. Management of VHS involves monitoring fish populations and implementing biosecurity measures to prevent outbreaks in aquaculture and natural ecosystems.