As well as evidence of contamination by heavy metals, in some sites bifenthrin and chlorpyrifos were found in sediments around Brisbane waterways (Mortimer et al.,1997). Oysters in the Redcliffe area have tested positive for the presence of chlorpyrifos at every site tested, although the latest results were negative for bifenthrin (Keys et al., 2002

http://www.hpw.qld.gov.au/SiteCollectionDocuments/ReviewOfTermitisidesInAustralia.pdf