Evaluation of some commercial fish species otoliths in Fereydunkenar’s water

This study aimed to evaluate the morphological characteristics of fish otoliths in the waters of Fereydunkenar and. In this study, 12 species of the commercial fishes in the waters of Fereydunkenar were selected and biometric characteristics were done and the sagitta otoliths were extracted. The species were Ctenopharyngodon idella, Hypophthalmichthys molitrix, Cyprinus carpio, Rutilus kutum, Abramis brama and Hypophthalmichthys nobilis (Family: Cyprinidae), Chelon saliens (Family: Mugilidae), Esox lucius (Esocidae), Sander lucioperca (Family: Percidae), Clupeonella engrauliformis, Clupeonella grimmi (Family: Clupeidae), Oncorhynchus mykiss (Family: Salmonidae). Then, the shape, length, width and thickness of left and right otoliths were measured. The results showed the largest otolith (length of 8.27 mm) was from Chelon saliens and the smallest otolith (length of 2.15 mm) was from Hypophthalmichthys species. Since, these fishes were not the biggest and smallest of samples, there is not significant correlation between size of fish and otolith. The shape and size of otoliths were very different in these families and was same in two species of genus Clupeonella (Clupeonella engrauliformis, Clupeonella grimmi). So, the morphology of otolith has an important role for determination of closed species.