An unprecedented number of fish with red spots, lesions and parasites, as well as dead dugongs and turtles, have been found this year.

Fishermen and conservationists blame the state of the marine life on dredging to widen Gladstone Harbour to accommodate carrier ships servicing the booming liquefied natural gas and coal seam gas industries.
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© Trevor FalzonA bull shark with red marks on it caught in the Calliope River, Gladstone in October.
But the Gladstone Port Corporation does not believe the dredging is causing the disease in fish, and authorities say last year's wet summer may be a factor in the poor health of the harbour.

Water testing shows a number of sites within the harbour exceeded national guidelines for aluminium, copper and chromium. Experts say the levels pose a minimal risk to marine life; however, the Queensland Government has appointed an independent scientific panel to conduct more research.

View a gallery of photos of diseased marine life found in Gladstone waters, interspersed with quotes from local fishermen and stakeholders.