Abstract
Abstract. Bacterial agglutination, passive haemagglutination, complement‐dependent passive haemolysis, indirect immunofluorescence, agar gel immunodiffusion and agglutination with fractions of immunized fish serum were compared for detecting humoral antibody to the lipopolysacchande (LPS) of Edwardsiella icialuri Hawke in channel catfish. Bacterial agglutination titres averaged 1: 672; passive haemagglutination titres averaged 1: 1152; and complement‐dependent haemolysis titres averaged 1: 2360. Serum from non‐vaccinated fish ranged from 0 to 1:32. Indirect fluorescence and immunodiffusion demonstrated positive reactions to the LPS antibody. Fractionation of immune sera produced three fractions, one of which strongly haemagglutinated E. ictaluri but the other two did not. All six serological techniques were sensitive to E. ictaluri LPS antibody.
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