Abstract
Preferred characteristics of biological indicators for heavy metal monitoring in marine ecosystems were documented 30 years ago. Heavy metal data from Raine Island on the outer-northern Great Barrier Reef are presented to introduce additional attributes for consideration, including a widened choice of biological tissues due to advances in trace heavy metal analysis. Kidney tissues, visceral mass and adductor muscle from the giant clam ( Tridacna maxima), muscle tissue from trochus ( Trochus niloticus) and axial muscle from four species of fish were targeted. The kidneys of giant clams had concentrations of heavy metals from 2 (Zn) to 2780 (Ni) times higher than corresponding concentrations in adductor muscles. Also, tissues of giant clam and the muscle of trochus gave different signals with respect to bio-available heavy metals. Linear correlations for heavy metals within and between tissues of giant clam and within muscle tissue of trochus, offer opportunities for the use of surrogates as well as a possible mathematical basis for assessing trends in heavy metal pollution.
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