Trace metal contents of the pacific oyster (Crassostrea gigas) purchased from markets in Hong Kong

Y. H. Cheung*, Ming Hung WONG

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

32 Citations (Scopus)


Arsenic, cadmium, chromium, and copper concentrations of the Pacific oyster, Crassostrea gigas, purchased from four different markets were determined in this project. In general, gill tissue had the highest proportion of metal contents (34%-67%) when compared with other tissue parts (mantle, viscera, and adductor muscle), except for arsenic, which showed the highest level in adductor muscle (44%). Smaller oysters (longitudinal length of soft body part less than 6 cm) had higher metal levels than larger ones (longitudinal length of soft body part more than 6 cm), except copper. None of the four metals examined showed an obvious seasonal trend, although cadmium levels seemed to be higher in autumn and winter months. Arsenic, cadmium, and copper levels in oysters purchased from different markets and different months obtained in the present study were higher when compared with past reports. Cadmium levels, as high as 10.98 mg/kg (dry weight basis) have been obtained. This approaches the safety limit that may be hazardous to human health. Continual monitoring of cadmium and other trace metals of toxicological significance to man in Hong Kong seafood is recommended.

Original languageEnglish
Pages (from-to)753-761
Number of pages9
JournalEnvironmental Management
Issue number6
Publication statusPublished - Nov 1992

Scopus Subject Areas

  • Global and Planetary Change
  • Ecology
  • Pollution

User-Defined Keywords

  • Crassostrea gigas
  • Hong Kong
  • Pacific oyster
  • Trace metals


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