Differences in resistance of carp, Cyprinus carpio L., to atypical Aeromonas salmonicida

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Abstract
The degree of resistance to an atypical strain of Aeromonas salmonicida, the causative bacterium of carp erythrodermatitis, was examined in two strains of carp, Cyprinus carpio L.: a Polish line. R3, sixth generation of conventional inbreeding (full‐sib matings); and a Hungarian line. R8, fifth generation of conventional inbreeding. Comparisons were made between and within the two strains. Results showed a significant difference (P < 0·001) in the degree of resistance, with the Hungarian carp showing greater resistance than the Polish carp. Differences within each strain were also observed indicating a maternal influence on resistance. Two transferrin genotypes in three genetic combinations were identified (DD, DG, GG) but were not found to influence resistance.