Aquatic Diseases

Aquatic Diseases

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Aquatic Diseases


  1. To recognize the relationship between disease, stress, nutrition and water quality.
  2. To identify common aquatic diseases.
  3. To recognize symptoms and determine treatment options of common aquatic diseases.


  • Are abnormal conditions of organisms that impair bodily functions with specific symptoms and signs
  • Result from the following:

genetic or developmental error

illness or sickness



nutritional deficiency or imbalance


Robert Koch

  • First demonstrated the disease process in 1876 while studying anthrax
  • Identified the anthrax epidemic in domesticated animals and sought a solution
  • Determined a bacterium caused the illness by establishing a method of research

Koch’s Method

  • Consisted of the following steps:

find which organisms are common to all infected animals yet absent in healthy ones

isolate the organism

reproduce the disease under controlled conditions

re-isolate the same organism from the experimentally infected animals


  • Occurs from the following three factors:

susceptible host

pathogenic agent

environment which is unfavorable to the host yet favorable to the agent


  • Is defined as a stimulus which disrupts homeostasis in an animal
  • Causes animals to use more energy to maintain homeostasis rather than fight diseases
  • Is different among aquatic animals because they are always immersed in their environment and cannot escape it

some pathogens are always found in water

Homeostasis – an organism’s ability to

maintain internal equilibrium


May be broken into the following four categories:

  • infectious
  • non-infectious
  • treatable
  • non-treatable

Infectious Disease

  • Develops from an infection
  • Potential relies on the following:
    • number of organisms
    • infectivity: ability to get into host
    • virulence: ability to cause disease
    • host susceptibility






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