For instance, Khaled [23] argued that because S. rivulatus is an herbivore, it accumulated higher concentrations of metals in their muscles than the carnivore Sargus sargus; This suggestion was not a reasonable cause for high metal accumulation in the current study since S. gibbus (a herbivore) recorded the lowest concentration of metals in most cases during the study, while the other herbivore (S. rivulatus) showed minor variations (as high concentrations of
Cu in liver).