Identification species of Acanthopagrus (family: Sparidae) and stock identification of dominant species in the Persian Gulf and Oman Sea using geometric morphometry and otolith
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AbstractIn this study, the identification of the Acanthopagrus species sparidae family by morphometric characters & meristic counts and the stock separation of Arabian yellowfin Seabream Acanthopagrus arabicus as the dominant species was determined through geometric morphometric and otolith shape in the west and east part of the Hormuz Strait. Samples were collected in five different areas including Khuzestan, Bushehr and Hormuzgan Waters as the west of Hormuz Strait, and Jask, Sirik and Sistan & Baluchistan Waters as the east of Hormuz Strait from June 2014 to May 2016. A. arabicus, A. berda and A.bifasciatus were identified in the northern part of the Persian Gulf & Oman Sea, the first one was identified as a dominant species of this genus. Evaluation of morphometric characters and meristic counts indicated that individuals of A.arabicus in west and east of Strait of Hormuz were significantly different from each other which showed high phenotype diversity of this species (p<0.05) and 85.3% of the individuals were categorized precisely in the correct classification which indicated as a key identification method in the region. From the meristic counts, the number of scales on the lateral line, on the chin and scales from the fifth and ninth spine of dorsal fin to the lateral line were the factors of separation in the west and east of the Strait of Hormuz. Body shape analysis was showed the most variations on the head and top of the body and significant differences of body shape was proved between west and east of Strait of Hormuz. Landmark positions in the samples of the west Strait of Hormuz were indicated the decrease of body depth, increase of head length, leaning of base and pectoral and ventral fin to upper part of the body, meanwhile it was contrary in the samples of the east. CVA correlation analysis showed a significant difference in body shape in the west and east of the Strait of Hormuz (P <0.0001). The otolith shape indices showed a significant difference in the west and east of the Strait of Hormuz and the results of the DFA analysis confirmed the accuracy of the classification of the species in the main region by 53.8 percent and the otolith shape in the west of the Hormuz Strait was more circular and had an equal growth in the length and width, while in the eastern part of the Strait of Hormuz they had more growth and aspect ratio, ellipticity and form factor of the area were approved. The results of the otolith Fourier Shape Analysis showed that six components out of the 77 main components were expressed 90 percent of the cumulative strength and difference, and the most changes were observed in the dorsal and ventral part of the otoliths of the Arabian yellowfin Seabream, and 70.4% of individuals of this species were correctly classified in the west and east of the Strait of Hormuz. The results of this survey confirmed two separate stocks in the west and east of Strait of Hormuz.
Publisher or UniversityIranian Fisheries Science Research Institute