E. tarda has become an important bacteria for aquaculture in addition is associated with septicemia (edwardsiellosis) and fatal infection in other animals such reptiles, birds, marine mammals and humans. Edwardsiella tarda is a member of the family Enterobacteriaceae. The bacterium is a facultatively anaerobic, gram negative, straight rod with flagella. E. tarda has a worldwide distribution and can be found in pond water, mud, and the intestine of fish and other marine animals. It is spread by carrier animal feces.