A CQ fisherman has captured footage of what he says appears to be a 4m crocodile on the Fitzroy River bank on Saturday afternoon.
The fisherman, Brent Moore, posted a video of the riverbank, where he said the croc was sighted, to the CQ Camping and Fishing Information Only Facebook page.
His post said the croc was sighted near JBS Australia meatworks in Nerimbera.
The croc could be seen, but not close up in the footage.
Mr Moore posted on the video there were two men cast netting in waist-deep water about 500m from where the croc was spotted.
He pulled up to let them know about their "neighbour" but he claimed they "didn't really care".
The Morning Bulletin yesterday tried to contact Mr Moore, but had no luck getting through to him.
Department of Environment and Heritage Protection senior ranger Mick Conaghan said the department was aware of the sighting but it had not been officially reported to them.
He encouraged anyone who spotted a croc on any local beaches or in any estuaries to report it to 1300 130 375, so rangers and authorities could monitor the croc's movements.
Mr Conaghan said it was also common among some fishers for them to dump their fish waste into the water, near boat ramps.
He warned fishermen not to do that because the unwanted waste would attract crocs to those areas.
Authorities urged the fisherman who captured the footage to contact the department immediately.
"We would like to warn recreational river users and fishermen not to approach crocs and to steer clear of them... they are dangerous and are known to be in various parts of the river," Mr Conaghan said.
December 31, 2014: A croc sighting was reported at Laurel Banks on the Fitzroy River. The area is a known crocodile habitat.
December 9, 2014: A croc was reported off Kemp Beach, Yeppoon. A site inspection revealed no evidence of a crocodile. Recent crocodile sighting signs were erected after the sighting.
November 11, 2014: A sighting was reported at Wreck Point, Yeppoon. The crocodile was moving through the area. Queensland Surf Life Saving and Coast Guard were notified.