Transfer of R Factor in the Intestinal Tracts of Fish and Sterilized Water of Cultured Pond

Abstract

In vitro transfer of R factors in sterilized fish culturing pondwater was observed from the strains of Escherichia coli K-12, CSH-2 (R⁺) and Enterobacter cloacae 0-20 to the strain of Aeromonas liquefaciens Y61 SM^γ (R^-) but was not observed from A. liqufeacinns A-17 and 8L2 to E coli CSH-2 (R^-). The sterilized pond water supported the growth of these bacteria.
In vivo transfer of R factors in the intestinal tracts of carp from E. coli CSH-2 (R⁺) to A. liquefaciens Y62 SM^γ (R^-) were hardly observed.