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Home How do fish get sick? Sickness or disease in fish occurs when the animal can no-longer maintain homeostasis, or balance, within its body. Several factors influence an individual's potential for disease, including: the fish's current health state or well-being (e.g., parasite load, body condition), the presence of pathogens (e.g., bacteria, viruses, fungi), and impact of environmental stressors (e.g., pollution, change in water quality, trauma). In a healthy system, there is a low incidence of disease in fish populations due to low-level host (fish) susceptibility, relatively low levels of pathogens in the water (and sediment), and minimal external environmental stressors. These three concepts are represented as a triad of circles below. As the presence of pathogens or environmental stress increase in influence or the fish's state of well-being diminishes, conceptually the circles overlap more in the middle, and the disease potential for that individual increases.
Fish Disease Information:
Website and content maintained by UM Aquatic Pathobiology Center and
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Fish Health