Suspected suspicious fire burning on Great Barrier Reef 'sensitive' marine site, home to threatened species

National Parks and Wildlife officers say the blaze is impacting the fire sensitive marine plain. (Supplied: Queensland Department of Environment and Science)

Rangers are continuing to battle what they believe is a suspicious fire in a sensitive marine area on a southern Great Barrier Reef island. 

The Queensland Parks and Wildlife Service (QPWS) said on Sunday its team had finished two planned burns in the north part of Curtis Island, near Gladstone.