The objective of this study was to determine the copper accumulation andelimination of Haliotis diversicolor supertexta fed with copper contaminated seaweed Gracilaria verrucosa. The sea weed was cultured in the copper solution at0, 0.05, 0.10, 0.20, 0.30 and 0.40 mg/l. The amounts of copper accumulated inGracilaria increased proportionaly with concentration and time. At theconcentrations of 0.2mg/l and above the amounts of accumulation of copper in theabalone increased proportionaly with time, but it was not so at theconcentrations at and under 0.1mg/l. The abalone fed with Gracilaria containingcopper, the accumulation didn't increase with copper concentration inGracilaria. The equilibrium of copper contents was at 0.4mg/l for the period of60 days. The amounts of accumulation of copper in viscera were higher than feetin the abalone. After the 80 days feeding experiment with copper contaminatedGracilaria, the abalone then fed with copper free Gracilaria for 60 days, copperconcentration decreased with time.