AERIAL photographs taken before and after a huge dredging project carried out near Gladstone Harbour show the devastation caused by dredging, a green group claims.
However, the Gladstone Ports Corporation (GPC) says the images likely illustrate turbidity caused by significant tidal changes which occur in the area.
The Australian Marine Conservation Society (AMCS) has released two aerial images of Port Curtis off Gladstone Harbour - one taken in 2005 and the other in 2011.
In the earlier photo the water appears pristine, while in the later it is murky and brown.
Over this period about 36 million cubic metres of soil was dredged from the port as part of the Port of Gladstone Western Basin Dredging and Disposal Project.
The dredging was carried out so larger ships could access the Gladstone Harbour.
AMCS spokeswoman Felicity Wishart says the images indicate the devastation caused.
"It shows you just how much the beauty of Gladstone Harbour has been lost and the environmental consequences are still unclear," she told AAP.
"This harbour has been muddy and sludgy like this for years [because of dredging]."
However, a GPC spokeswoman says the images likely illustrate turbidity caused by significant tidal changes.
GPC has undertaken significant research looking at the overall health of the harbour and tests water quality every 15 minutes, the spokeswoman said.
They said reports such as the Curtis Coast Coastal and Marine Inventory Resource shows the cumulative impact of development in the Gladstone Harbour over the past 20 years had been minimal.
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