Abstract
Our laboratory has developed a biofilm oral vaccine of Aeromonas hydrophila, which has given significantly higher antibody agglutination titre and protection in herbivorous carps and omnivorous walking catfish compared to that with free cell vaccine. Against this background, in the present study A. hydrophila biofilm oral vaccine was evaluated in Channa striatus, a carnivorous fish model. The fish was fed with biofilm (BF) and free cell (FC) of A. hydrophila vaccine at 1010 cells/g fish/day for 20 d. Serum antibody production monitored with a monoclonal antibody based ELISA for 60 day post vaccination. Significantly higher antibody titre was recorded with BF compared to that with FC. Furthermore, BF vaccinated fish upon challenge with A. hydrophila at 109 cfu/ml had significantly higher relative per cent survival (88) than that with FC (29.6).
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