Abstract
Disease management in aquaculture is complicated by the fact that various fish species generally vary in their susceptibility to pathogenic microorganisms, thus requiring that every species be studied independently. The present work was performed to investigate the susceptibility of marbled rabbitfish Siganus rivulatus to the potential bacterial pathogens: Aeromonas hydrophila, Mycobacterium marinum, Vibrio anguillarum, Streptococcus iniae, and Yersinia ruckeri. Fish were challenged with the various bacteria and survival and hematological responses were evaluated. Mortalities in all treatments were not significantly greater than the control. However, analyses of hematological parameters suggest that M. marinum is potentially pathogenic to S. rivulatus. Additionally, we investigated whether lesions found on wild fish collected from Beirut beach contained any of the five bacterial species of interest. None of these bacteria were present in the lesions, thus suggesting that lesions were caused by other microbes.
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