PCA analysis showed that the contribution rates were 3.28% to 40.36%, respectively (Figure 8). 111 individuals were clustered into different subgroups at the level of population PCA. Seven populations of Jinsha River, except for SWL, the other 6 populations were a subgroup. Six populations of Yalong River, except Huoqu River, the other five populations were in a subgroup. This was consistent with the results of phylogenetic analysis.