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Echlnoids Paracentrotus l iv~dus (Lamarck, 1816) were contarmnated under laboratory conditions with Cd (as CdC1,) either from sea water or from both sea water and food (Posldon~a oceanica leaves) simultaneously The expenrnental results showed that Cd bioaccumulation in the digestive tract wall and Aristotle's lantern of echlnoids contaminated via both sea water and food was significantly less (as much as 50%) than when echinoids accumulated Cd from sea water only The opposite trend was observed for the coelomlc fluid of these echinoids. These observations suggest that food containing high Cd concentrations (1) reduces the efficiency of the dgestive tract wall and Anstotle's lantern in taking up Cd from sea water, and (2) could enhance metal depuratlve activlty of the echinoid coelom.

Effect of feeding on cadmium bioaccumulation in the echinoid Paracentrotus lividus (Echinodermata)