Imposex still evident in eastern Australia 10 years after tributyltin restrictions

Craig P. Gibson, Scott P. Wilson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


A survey of imposex in Thais orbita (Neogastropoda) along the New South Wales (NSW) coast, Australia, found imposex was still widespread 10 years after a partial ban on tributyltin (TBT) based antifouling paints. Transplant experiments also revealed that imposex was induced in T. orbita over a period of 9 weeks in Sydney Harbour, NSW. A comparison of the imposex data with that collected shortly after the introduction of restrictions on TBT revealed a general decline in imposex frequency occurring at open coast sites, an exception being the site at South West Rocks. Sites located within harbour/bay areas did not display a decline in imposex frequency but a decline in the severity of imposex was apparent. The observed decrease in imposex values in T. orbita may reflect a general decrease of butyltin contamination within the coastal environment. However, the persistence of contamination "hotspots" within harbours and bays remains a concern.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalMarine Environmental Research
Issue number2
Publication statusPublished - Mar 2003
Externally publishedYes


  • Australia
  • Bioindicator
  • Gastropod
  • Imposex
  • Thais orbita
  • Tributyltin (TBT)


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