The upturned boat of a fisherman missing in central Queensland has been found as a search for the man continues.
Police said the 69-year-old went fishing in Gayundah Creek near Hinchinbrook Island about 3pm on Thursday.
He was due back after an hour but failed to return and his wife called police.
Officers couldn't reach him by radio and began a search.
They found his upturned boat about 2.30am on Friday, but have found no other sign of the man.
Ren Bone, from the Queensland Parks and Wildlife Service said the assessment of damage to the boat on Friday is consistent with that of a crocodile.
However, the exact circumstances of events remain unknown.
Police hold concerns due to the environmental conditions in the area, with boats and aircraft being used in the search, along with SES personnel.
"The search is focusing on coastlines and creeks, however we are also looking at searches through the water as well," Inspector Andrew Cowie said.
"We're going to continue searching until we have gotten expert evidence to indicate that's not viable or we find him.
"As long as there's a chance that he is alive the search will continue."
Inspector Cowie said the man was an experienced boatie, but had no safety equipment with him other than his radio.