IBS clustering of all samples. MDS file was extracted and plotted using R package. The first dimension (d$C1) was assigned to X axis, and the second dimension (d$C2) was assigned to Y axis. Purple symbols represented C. carpio samples, and different strains were plotted with different shapes. YR represents Yellow River carp, SP for Songpu mirror carp, XG for Xingguo red carp, HB for Hebao carp, SH for Songhe carp, and KOI for Koi. Symbols with other colors represented other eight species.