Cadmium uptake and zinc-cadmium antagonism in Australian tropical rock oysters: potential solutions for oyster aquaculture enterprises

Munksgaard, Niels C., Burchert, Shannon, Kaestli, Mirjam, Nowland, Samantha J., O'Connor, Wayne, and Gibb, Karen S. (2017) Cadmium uptake and zinc-cadmium antagonism in Australian tropical rock oysters: potential solutions for oyster aquaculture enterprises. Marine Pollution Bulletin, 123 (1-2). pp. 47-56.

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Abstract

Variable and occasionally high concentrations of cadmium in wild oysters at a remote location with the potential to develop aquaculture enterprises motivated research into the distribution and sources of metals in oysters, seawater, sediment, suspended solids and phytoplankton. Saccostrea mytiloides and Saccostrea mordax contained cadmium concentrations exceeding the food standard maximum level (ML) at three of four sites. At one site with high zinc levels in sediment, oyster cadmium levels were below the ML. Metal levels in seawater were not correlated with cadmium levels in oysters but high cadmium/zinc ratios were measured in Trichodesmium erythraeum blooms. We suggest that oysters accumulate cadmium mainly from annual phytoplankton blooms except at sites where zinc availability is sufficiently high to prevent uptake though a mechanism of antagonistic exclusion. Knowledge of the source and uptake mechanisms of cadmium in oysters should lead to new management strategies to reduce cadmium levels in farmed oysters.

Item ID: 52275
Item Type: Article (Research - C1)
ISSN: 1879-3363
Keywords: antagonism, aquaculture, Australia, cadmium, Northern Territory, oysters, phytoplankton, zinc
Funders: Fisheries Research and Development Corporation (FRDC), Territory Natural Resource Management (NTRM)
Projects and Grants: FRDC: 2012/223, NTRM00377
Date Deposited: 26 Feb 2018 22:56
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
SEO Codes: 96 ENVIRONMENT > 9606 Environmental and Natural Resource Evaluation > 960699 Environmental and Natural Resource Evaluation not elsewhere classified @ 100%
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