“…However, any intensive bio-production, whether on land or at sea, will experience disease problems [ 1 ]. Among the problems that the aquaculture industry has to address, infectious pathogens are the most important [ 2 , 3 , 4 ]. In 1993, the economic losses caused by the infectious pathogens are more than ten percent of the total value of the fishery industry [ 5 ], and the loss ratio is increased gradually in the last decades.…”