The asymmetry in the sagitta of the European eel <i>Anguilla anguilla</i> (Linnaeus, 1758) collected from the Söke District of Aydın Province in Western Anatolia, Türkiye

Abstract Otolith features (length, width and weight) of 74 individuals of Anguilla anguilla collected from the Söke District of Aydın Province in Western Anatolia, Türkiye were studied for the first time to evaluate the level of asymmetry in the otolith features selected for this study. The asymmetry value of the otolith length was greater than that of otolith width and otolith weight. The asymmetry value of the three otolith features increased with an increase in the fish's length. The likely cause of asymmetry in the otolith parameters examined has been discussed in relation with the variability in growth provoked by ecological influence associated with the discrepancy in habitat setting and contaminants present in the Söke District of Aydın Province in Western Anatolia, Türkiye.