The maximum value of lead (Pb) in the tested seaweeds was 0.05 mg/100 g (Table 3), this value exceeded the values recorded by Real (1978) which amounted to 65 mg/100 g, and Almela et al. (2006) which amounted to 1 mg/100 g. The relatively high levels of some heavy metals in the alga reflect firstly the high concentration of the metals in the study area and secondly the capacity of the alga to take them up (Karez et al., 1994).