highly significantp < 0.01
The D‐ statistics detected highly significant (| Z | > 3; p < 0.01) introgression/hybridization between: (a) G. rufa (P 2 ; the Dalaki River) and G. gymnothorax (P 3 ; the Karun River; f 4 ‐ratio = 18%), (b) G. rufa (P 2 ; the Dalaki River) and G. gymnothorax (P 3 ; the Karkheh River; f 4 ‐ratio = 16%), (c) G. rufa (P 2 ; the Jarahi River) and G. gymnothorax (P 3 ; the Karun River; f 4 ‐ratio = 19%), and (d) G. rufa (P 2 ; the Dalaki River) and G. rufa (P 3 ; the Tigris River; f 4 ‐ratio = 16%) (Table 3 ).