Document Detail


Pearl aquaculture-profitable environmental remediation?
MedLine Citation:
PMID:  14967499     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Bivalve molluscs are filter feeders, with pearl oysters able to filter water at rates up to 25 lh(-1)g(-1) of dry wt. tissue. Since this process leads to rapid bioaccumulation of recalcitrant pollutants such as heavy metals, organochlorine pesticides and hydrocarbons from impacted sites, it has prompted the widespread use of molluscs as biomonitors to quantify levels of marine pollution. This paper proposes pearl oyster deployment as a novel bioremediation technology for impacted sites to remove toxic contaminants, reduce nutrient loads and lower concentrations of microbial pathogens. Estimates extrapolated from the literature suggest that a modest pearl oyster farm of 100 t oyster material per year could remove 300 kg heavy metals plus 24 kg of organic contaminants via deposition into the tissue and shell. Furthermore, it was estimated that up to 19 kg of nitrogen may be removed from the coastal ecosystem per tonne of pearl oyster harvested. Pearl oysters are also likely to filter substantial amounts of sewage associated microbial pathogens from the water column. Method of cultivation and site selection are the key to minimising negative environmental impacts of bivalve cultivation. Deployment of oysters at sites with high nutrient and contaminant loadings would be advantageous, as these compounds would be removed from the ecosystem whilst generating a value-added product. Future potential may exist for harvesting bio-concentrated elements for commercial production.
Authors:
S Gifford; R H Dunstan; W O'Connor; T Roberts; R Toia
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Science of the total environment     Volume:  319     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-02-17     Completed Date:  2004-03-17     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  27-37     Citation Subset:  IM    
Affiliation:
School of Environmental and Life Sciences, University of Newcastle, Newcastle 2308, Australia.
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MeSH Terms
Descriptor/Qualifier:
Animals
Aquaculture / economics*
Metals, Heavy / pharmacokinetics*
Nitrogen / metabolism
Ostreidae / metabolism*
Water Pollutants / pharmacokinetics*
Water Pollution / prevention & control*
Chemical
Reg. No./Substance:
0/Metals, Heavy; 0/Water Pollutants; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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