Otolith morphological study and biometric analysis of two hermaphrodite species Sarpa salpa and Serranus scriba (Linnaeus, 1758) in Bizerte Sea

In this study two hermaphrodite species samples of Bizerte sea.In order to compare the morphological variability (Fourier coefficients) and biometric charcaters (length, width, area and otolith perimeter). The result show a significant results that are clearly demonstrated by an asymmetry when comparing otoliths (P < 0.05) for S.scriba and for S.salpa showed a symmetry (P = 0.056).However for biometric comparison, between the rigth and left otoliths for each population, we detected a highly difference between otolith in all the parameter of S.salpa . All these difference existing between the two species can be related to the environmental specificity and stress. In addition, asymmetry in width character is could be explained by the vulnerability of this trait to immediate changes in environmental factors.