• Journal of fish pathology
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• v.5 no.1
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• pp.19-27
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• 1992

A formalized bacterin(FKC) of Edwardsiella tarda, conjugated with/without Freund's complete adjuvant(FCA), Freund's incomplete adjuvant(FIA) and potassium aluminium sulfate(PAS), was administered by intraperitoneal injection to tilapia respectively. The tilapia were reared under indoor recirculating filter system. There were agglutinin titer increment in the tilapia which were administered not only FKC bacterin but also adjuvanted vaccines. But the producing time of the highest level of antibody in the immunized tilapia was different among vaccine preparation, i. e. FKC+FCA group and PAS+FKC group are between the 2nd and the 4th week, and FKC alone group is the 2nd week. In the challenge experiment with $2.5{\times}10^7\;CFU/ml$ or $2.5{\times}10^8\;CFU/ml$ of E. tarda T1123 to the tilapia immunized with vaccines, RPS above sixty was recorded both challenge dose in the tilapia which were 3 weeks after immunization with FKC+FCA, PAS+FKC and FKC alone, and the former dose 8 weeks after immunization with FCA+FKC and PAS+FKC. There were some resistance enhancement against E. tarda in the tilapia which were injected with adjuvant alone than that of control. As the results, the FCA or PAS adjuvanted vaccine is effective to sustain the defensible period against edwardsiellosis.