Bacteria is one of the primary causes of disease in fish. The detection, prevention, and control of infectious diseases for fish remains one of the most important considerations for their successful culture. Worldwide, approximately 35 species of bacteria have been isolated from or associated with diseased fish. Of these, 12 species of bacteria are considered major pathogens of fish, and five are considered obligate pathogens (only causes disease in fish).
and isolation of bacteria on appropriate media is the standard method used
for diagnostic screening, monitoring of stocks, and fish health inspections
for bacterial pathogens. Initial isolation and biochemical tests are preformed
to identify the bacteria. The bacterial culture can also be tested against
various antibiotics for effective treatment of some diseases. Bacteriological
testing, from collection to positive identification, usually takes 3-4 days