Aquaculture faces significant challenges due to diseases that impact both economic and socio-economic progress. The expansion of fish farming, characterized by higher stocking densities and diverse species, exacerbates the frequency and severity of outbreaks caused by bacterial, viral, and parasitic pathogens. These diseases often result in mass mortalities and reduced production efficiency. Disease dynamics in aquatic systems are influenced by complex interactions between host, pathogen, and environmental factors, including water quality, temperature, and overcrowding. Pathogen transmission is facilitated through various pathways, such as infected stocks, contaminated equipment, and water currents. Additionally, human activities, climate change, and inadequate biosecurity measures further contribute to the spread of diseases. Key viral pathogens affecting aquaculture include epizootic hematopoietic necrosis virus (EHNV), infectious salmon anemia (ISA) virus, and tilapia lake virus (TiLV), each with unique transmission routes and clinical manifestations. Bacterial pathogens, which account for approximately 34% of fish diseases, also pose significant threats, exploiting stress-induced vulnerabilities in fish. Effective disease management in aquaculture requires enhanced research, surveillance, and control measures to mitigate the impact of these pathogens on fish health and production.