Development of oral prophylaxis against bacterial haemorrhagic septicaemia syndrome for aquaculture species
Aeromonas hydrophila is rated as one major causative agents of bacterial haemorrhagic septicaemia syndrome in aquatic species, but other etiological agents are Edwardsiella tarda, Pseudomonas fluorescens and Vibrio spp. The occurrence of bacterial haemorrhagic septicaemia disease in Rainbow trout experimentally challenged with virulent strain of Aeromonas hydrophila after being fed with Vitamin C and LPS supplemented prophylactic diets for 14 days was examined in this study. Polymerase chain reaction PCR was used to diagnose the causative agent and the present of this bacterium in the challenged fish. Mortalities from control group peaked at 70.6 % as compared to 17.6 % and 0 % in Vit. C and LPS treated groups respectively. Furthermore, surviving fish from the treated groups did not show any evidence of infections and the bacteria was not detected in them. However, using the methods of detection described, it would appear that the oral prophylaxis (supplemented diets) were able to protect the fish from the virulent Aeromonas hydrophila infections.