Owing to its recent increased profitability in Israel, a signif-icant economic incentive exists to extend Grey mullet’s cultureto the Upper Galilee region (Northern Israel), where tilapia cul-ture is limited due to low water temperatures. However, severalrecent attempts to accustom the fish to the local Dan stream water,which is characterized by extremely low salinity (EC ∼0.37 mS/cm,i.e., TDS of ∼250 mg/L) and particularly very low Na+, SO42−, Cl−and Mg2+concentrations (Ca2+and HCO3−appear at higher con-centrations), resulted in substantial (>70%) fish mortalities at theearly growth stages