Aquatic disease epidemiology is the study of the occurrence, spread, and control of diseases affecting aquatic species. In aquaculture, it is critical for preventing outbreaks that can devastate fish populations and impact production. Understanding the transmission patterns of pathogens like bacteria, viruses, and parasites allows for the development of effective prevention and control strategies. Epidemiological studies also involve identifying risk factors such as water quality, stocking density, and environmental stressors. By applying epidemiological knowledge, aquaculture systems can implement biosecurity measures, vaccination programs, and better management practices to reduce disease incidence. Disease management in wild fisheries is equally important, especially in areas where species are under threat from emerging diseases.