Conserved syntenies between the rainbow trout RT02 linkage group and two homeologous chromosomes of the medaka (Figure 1a) and stickleback (1b). Ola01 and Ola08 in medaka, group IX and group XI in stickleback, result from the duplication of the same ancestral chromosome at the time of the 3rd Whole Genome Duplication in fish. Centromeric regions are approximately delineated by underlined, blue bold type, marker names following . Red and green lines identify the two chromosome arms of RT02. See Additional file 7, Additional file 8 and Additional file 9 for complete graphic representation of the conserved syntenies between rainbow trout and the three model species.