Abstract
Blood clam, Tegillarca granosa, habit in near-shore muddy sediments facing increasing danger of heavy metal contamination. In order to assess the acute toxicity of heavy metals on T. granosa, short term lethal concentration (LC50) of copper (Cu), zinc (Zn), lead (Pb), and cadmium (Cd) were determined, symptoms of death and organic lesions were illustrated. With relative high LC50 values obtained, T. granosa showed great heavy metal tolerance indicates adaptations to habitat environment. T. granosa died in acute Cd exposure showed specific death symptom with foot extended outside of the tightly closed shells. In this study, different metals led to different organic lesions. Dark red erosive and inflamed gills were observed for T. granosa exposed to acute Cu and Pb, respectively. Inflamed gonad and foot, and contracted mantle were observed for Cd and Zn exposure trials, respectively. The results of this study may provide knowledge to assist in heavy metal pollution bio-monitoring and quick diagnosis of massive death incidence.
Published Version
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