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Summary of environmental impacts |
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SHELLFISH
Contaminant LoadsDeployed oysters and mussels
have been used to assess the impacts of several outfalls in NSW. These
have usually been associated with the larger outfalls in the Sydney and
Newcastle regions. Diversion of sewage from nearshore to offshore areas
in Sydney resulted in a significant drop in the concentrations of
organochlorine compounds in oysters deployed near the shoreline outfalls
(Scanes 1996). In mussels deployed near the new deep ocean outfall at
Malabar, the outfall was suggested to be a significant source of
chromium, arsenic, silver and lead (Andrijanic 1993). Outfalls on the
Kurnell peninsula were also found to be a significant source of trace
metals in deployed mussels (AWT 1994). In contrast, no outfall effects
were found for contaminants in oysters deployed near the Newcastle
outfalls (Ajani and Wansborough 1996). |
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(Impac_6) Last updated May 2000 |
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