The accumulation of Cd has also been described in different tissues of
crustaceans (Zanders andRojas,1996). Bigi etal.(1996) reported
Cd accumulation in the gills and carapace of an estuarine crab
Chasmagnathus granulate. Shrimps and crabs have been well
established as bioindicators for monitoring the concentration of
heavy metals(Kargin etal.,2001;Vazquezetal.,2001).