“…The ability of marine mussels to biologically incorporat9 trace metals in their tissues has been well estabhshed; most of the studies have been carried out on the soft tissue (Amiard et al, 1986;Bloom & Ayling, 1977;Bryan, 1980Bryan, , 1983Coleman et al, 1986;Cossa et al, 1979;Davies & Pirie, 1980;Di Giulio & Scanlon, 1985;Farrington et al, 1983;Galloway et al, 1983;Gault et al, 1983;Goldberg, 1975;Goldberg et al, 1978Goldberg et al, , 1983Hung et al, 1981Hung et al, , 1983Johnson & D'Auria, 1980;Julshamn, 1981;Karbe et al, 1977;Langston, 1986;Martinci~ et al, 1984;M6ller et al, 1983;Phillips, 1976aPhillips, , 1976bPhillips, , 1977bPhillips, , I977c, 1978Popham & D'Auria, 1983a, 1983bRitz et al, 1982;Segar et al, 1971;Slabyj & Carpenter, 1977;Szefer, 1986;Szefer & Szefer, 1985;Szefer & Wenne, 1987). However, the number of articles on the concentration or distribution of metals in shell material, particularly relating the metal concentration in the soft tissue to that in the shell is scanty (A1- Dabbas et al, 1984;Bertine & Goldberg, 1972;Carriker et al, 1980bCarriker et al, , 1982Chow et al, 1976;Ferrell et al, 1973;<...>…”