Boat owners have been asked to join the search for a man missing from a sunken fishing trawler in the Outer Hebrides.

Chris Morrison, 27, and Martin Johnstone, 29, died when the Louisa sank at anchor near Mingulay, south of Barra, on Saturday morning.

Paul Alliston, 42, remains missing despite a major search operation by police and the coastguard over the weekend.

Lachlan Armstrong, 27, decided to swim for shore when the crew's life raft failed to inflate and was rescued from Mingulay by the Coastguard.

The men are believed to have been asleep when the Stornoway-registered crab trawler went down in the early hours of the morning.

Barra RNLI has asked boat owners in Uist, Barra and Eriskay to join them in a land and sea search on Thursday evening.

A spokesman said: "We are organising a full-scale sea and land search for the missing crewman from the Louisa.

"Any boat owners who can spare the time and any other persons who can willing to walk the shorelines around the area are asked to meet in Castlebay Hall on Wednesday night at 7pm to discuss plans for Thursday's search."

Mr Armstrong, who recently became a father, said he was convinced the rest of the crew would survive.

"It's hard to explain exactly how I feel - the relief at being alive but at the same time the regrets and the sympathies I have for all the families involved," he said.

"It'll never leave me, it's just so tragic. I can't put into words how devastating and upsetting it is.

"The water was so cold and the raft wasn't keeping us dry as it never inflated. That's why we weren't out of the water. You know the only way you can survive is to get out of the water and get away."