Similarities and differences between vibriosis in European sea bass caused by Vibrio anguillarum and Vibrio harveyi

Vibrioses caused by different members of the genus Vibrio are common diseases in aquaculture characterised systemic infections, high mortalities, and economic losses fish shellfish. Farming European sea bass (Dicentrarchus labrax) gilthead seabream (Sparus aurata) has rapidly grown over last decade Croatia but its efficacy is significantly jeopardized due to anguillarum harveyi infection. Therefore, we studied compared most prominent similarities differences environmental conditions, clinical signs conventional molecular diagnostic methods vibriosis both bacterial pathogens. Outbreaks bream V. mostly occur during spring autumn, following a fast increase or decrease temperature, whereas infections with summer months at temperature above 20o C. They have similar appearance acute form subacute forms they differ. infection characterized massive haemorrhages abdominal wall, while keratitis, corneal opacity uncoordinated swimming behaviour noticed. Necropsy disclosed liver, intestine stomach anguillarum, sero-catarrhal enteritis distension ascites case harveyi. Although tools enable correct identification, this study defined main capable distinguishing from based on traditional bacteriological identification such as sensitivity O/129 (10 µg) novobiocin, enzymatic activity β-galactosidase, arginine dihydrolase amygdalin fermentation.