The tolerance of P. imbricata to particular pollutants is of further interest because pearl aquaculture has recently been proposed as a coastal remediation technology (Gifford et al. 2004).Pearl oysters have a high filtration rate, concentrate pollutants and nutrients within their tissues, and they yield a valuable product that is not bound for human consumption. However, the success of a pearl oyster remediation system would rely on the profitability of pearling operations to make the coastal remediation commercially viable. Therefore, it is necessary to investigate the oyster’s tolerance limits, for both general pearl oyster health and pearl quality.