The search and rescue operation for a fisherman missing in waters off Mackay will enter its fourth day today.
Police continue to hold grave fears for the welfare of the 41-year-old Grasstree Beach man, who has been missing since the boat he was on sunk last Thursday.
The seven-metre vessel had been carrying three people, when it went under near the Creal Reef, in the Coral Sea.
All three men became separated in the water, with two of the men rescued on Friday.
Police and Volunteer Marine Rescue have searched an area of around 100 square nautical miles of waters considered to be points of interest.
The search party consists of five vessels and Townsville-based QG Air helicopter.
The RACQ CQ Rescue helicopter located one of the men clinging to the overturned boat on Friday morning.
The 44-year-old Grasstree Beach man was retrieved by VMR at approximately 7.00am and transported to Mackay Base Hospital in a serious condition.
The second man, a 43-year-old Bray Park man, was located by the rescue helicopter just after 11.00am.
He was rescued by VMR and flown to Mackay Base Hospital for treatment.
Boaties and other recreational water users are asked to immediately report sightings to police.