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Abstract
Two populations of walking catfish, Clarias macrocephalus, with different genetic backgrounds were subjected to mass selection for resistance to Aeromonas hydrophila for one generation by IP injection of 1 x 101 cells A. hydrophila/mL. No significant difference between selected and control lines were observed in survival rate and time at which 50% mortality occurred after disease challenge. Differences in mean were estimated. Heritability values for the two populations were 0.17 and 0.10.