Contamination of Barilla Bay's Dunalley oyster bed has been blamed on a leaking sewer pipe.
A LEAKING sewage line under the Denison Canal at Dunalley has been blamed for contaminating oysters and causing widespread food poisoning.
The number of people who have suffered gastroenteritis after eating contaminated oysters from Barilla Bay has reached about 200, with fears the illness has spread to Queensland as well as Victoria.
Harvesting of oysters from the lease at Dunalley Bay has stopped.
Questions have been raised about the issue of sewage in Tasmania, including a new rule that allows Dunalley home builders to send effluent into settling ponds rather than first into septic tanks.
Public Health director Roscoe Taylor said Sorell Council inspectors had injected dye into a pipe running into the bay from a private property.
"As a precautionary measure, there's a further oyster lease about 2km out to sea, which we've today advised the owner to shut," Dr Taylor said.
The leak was not far from the oysters believed to have been contaminated by human waste containing norovirus.
Dr Taylor said the pipe – which has been plugged – was likely to be more than a decade old and may have been damaged by a boat or anchor.
Barilla Bay owns the main lease affected as well as oysters in Pitt Water that were closed as a precaution last week after a different sewage spill.
If tests give the all-clear, Barilla Bay could be selling oysters free of health concerns within days.
Results from Pitt Water testing may be available today.
Dr Taylor said the pipe was almost certainly the cause at Dunalley, although he could not rule out other sewage overflows.
It was still important to grapple with the issue of boats dumping waste overboard, he said.
About 100 cases of oyster-related illness had been reported in Tasmania and 80 or more in Victoria, while Queensland was on alert in case it received contaminated oysters.
Many victims had been treated in hospital with intravenous hydration.
Barilla Bay general manager Justin Goc said the company had not considered legal action.
Mr Goc said at least the company could be confident its production methods had not fallen down in any way, but that it had been hit by external contamination.
Dr Taylor said the business had been wise in acting quickly to voluntarily recall products.
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