Lymphocystis Disease is a viral infection that primarily affects fish, particularly species like tilapia and trout. It is caused by the Lymphocystis virus, which leads to the formation of benign tumors or cysts on the skin, fins, and gills of infected fish. These growths can vary in size and may cause physical discomfort or hinder swimming. The disease is typically associated with poor water quality and stress in fish populations. While Lymphocystis Disease is not usually fatal, it can lead to secondary infections if the cysts rupture. Maintaining a healthy environment is crucial for preventing outbreaks in aquaculture and natural habitats.