Abstract

Fish have great nutritive importance and represent an essential protein source for humans. However, because of the close interaction between the fish pathogens and the aquatic environment, fish culturing has raised issues related to fish health. In the aquatic environment bacteria are found ubiquitously and may cause huge mortality in wild as well as cultured fish due to the diverse diseases triggered by various bacterial species. Generally, most of the bacterial pathogens are thought to be a part of the common microflora that are found in the aquatic environment, but these are also considered to act as opportunistic or secondary pathogens. Diseases and infections inside the host body or in its physiology have a tendency to take place only when the fish is stressed because of insufficient diet, poor husbandry procedures, and polluted environmental conditions. Therefore in order to understand the various bacterial diseases of fish species, it is equally important to comprehend the correlation among the bacteria, its host, and its environment.

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