Estimated population structure as inferred by STRUCTURE analysis of microsatellite DNA data. White lines separate sampling sites. The most likely K for the analyzed samples is based on the ΔK method; no further structures were detected after the first step and within the excluded clusters. The population structure of the Panjica hatchery broodstock is magnified and shown between the arrows, with each column representing one individual (the number corresponds to the nominal number of individuals from Tab. S4). The red color illustrates the genetic proportion of the DA and the blue of the AT.