“…One of the earliest uses of molluscs as a bio-monitor was that of the marine green mussel P. viridis by Yap et al [ 50 ] who later also used the mangrove snail Telescopium telescopium [ 56 ] and the mangrove snail Nerita lineata [ 20 ]. Levels of metals in other gastropods were also studied in Argentina [ 57 ], Portugal [ 58 ], Russia [ 59 , 60 ], Japan [ 59 ], China [ 59 , 61 ], South Korea [ 59 ], France [ 62 ], Antarctica [ 63 ], Austria [ 64 ], Italy [ 3 ] and India [ 65 ] ( Table 6 and Table 7 ).…”