Envoronmental factors play an important role in shaping fish morphology, infact, it is the environment that makes the fish superfacial shape. It is based on the fish body shape that we can infer the type of swimming addition to its genetic characteristics, one can obtain the type of fish behavior and the type of fish habitat, thus, using the fish body shape, in morphological characteristics of populations of abu mullet in Iranian basins habitat and its characteristics. Therefore, this study aimed to compare the using geometric morphometric method. For this purpose, 162 specimens from morphometric characters, total length, fork length and standard length and body Bushehr Basin (Kaki, Mond, Heleh, Genaveh and Hendijan rivers), 24 from Tigris Basin (Karkheh River) and 14 from Hormuz Basin, were sampled. Three pectoral fin rays, gill rakers, number of lateral line scales, below lateral line weight were measured and 14 meristics including number of branched and unbranched dorsal fin rays, branched and unbranched anal fin rays, anal fin scales, above lateral line scales, predorsal and circumcaudal scales were rays, caudal fin rays, branched and unbranched pelvic fin rays, branched counted. Samples were photographed from the left side, then 18 land rays, number of marks were digitized using ImageJ software. Data obtained from Procrustes were analyzed by multivariate analysis of CVA and PCA. Comparison of meristic traits of studied populations including number of soft rays, number of gill lateral line scales, below lateral line scales, predorsal and circumcaudal scales showed significant differences (P 0.05). The results of CVA analysis in comparing Bushehr basin populations showed that highest mahalanubis and procrustes distance was between Hendijan and Kaki populations. and Tigris basins were compared and Kaki population showed the highest PCA analysis showed significant diferences between the populations when Hormuz difference with other populations (P 0.0001). The major differences observed pelvic fins position. were head size and position, body height, caudal peduncle length, dorsal and Key words: G eometric morphometry, Morphological properties land mark, proctor analysis
