“…Experimental demonstration shows that fish which are in poor environments, low water quality such as high nitrite levels, low levels of dissolved oxygen (DO) or high levels of carbon dioxide (CO 2 ) are more susceptible to infection by Aeromonas hydrophila. Additionally, a seasonal incidence of a higher number of rep-ted fish deaths in the spring is associated with decreased water temperatures (El Mejri et al, 2008). Based on these observations, we suggest that low densities of A. hydrophila in internal organs, coupled with high water temperatures and stress induced by extreme trapping procedures and handling, are sufficient to create physiologic conditions conducive to rapid proliferation of the bacteria.…”