Boaties take to the water as search continues for missing Brisbane fisherman Trent Riley

Family and friends of missing Brisbane man Trent Riley have taken to the water in Moreton Bay, as a desperate search to find the young fisherman enters its fourth day.

The 26-year-old disappeared on a solo fishing trip on Wednesday afternoon.

His empty boat was spotted doing circles near Mud Island and his hat was later found floating off St Helena Island.

Friends, relatives and community members have used boats, jet skis and kayaks to join a large-scale search of the surrounding area.

Shannon Riley said he was still holding out hope of finding his brother alive.

“The impossible is going to happen again.”

Mr Riley said he was overwhelmed and grateful for…