Precise cause of the deaths of hundreds of fish first detected last week is unknown, with preliminary analysis suggesting oxygen deprivation

The deaths of hundreds of fish in Lake Macquarie are being investigated, with the New South Wales environmental regulator looking for “any potential pollution sources” that could have caused the mass kill.

Paul Winn, the lead researcher at the Hunter Community Environment Centre, said “probably several hundred to up to 1,000 fish” had been killed in Wyee Bay, on the southern end of Lake Macquarie near Newcastle, and washed ashore.

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