Oysters have long been known as the canaries of the estuaries and now researchers from University of New South Wales are putting them to regular work.Sydney rock oysters - which are not part of commercial operations but selected by researchers - are being used to chart the state of waterways from the Hunter Valley through to the New South Wales/Victorian border.
Doing their job as filter feeders the oysters will filter loads of water every day and if there is a containment in the water, they'll be exposed to that and they will respond.
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