The vessel made a mayday call yesterday afternoon on what was a calm, clear and sunny day off the tourist community of Tofino, a popular destination for whale watchers on Canada's West Coast, the Joint Rescue Coordination Centre said.
Lt-Cmdr Desmond James, a spokesman for the rescue agency staffed by Canadian military and Coast Guard personnel, said late Sunday that the agency's search concluded with five people dead, 21 rescued and one person missing.
The Royal Canadian Mounted Police will take over the search for the person who remains missing.
The boat, the 20-meter Leviathan II, was partially submerged 12 nautical kilometres west of Tofino.
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Tofino's mayor described the town's mood as tense but commended residents for their quick aid in the rescue effort.
"Everybody's heart is just breaking for what's going on here and wanting to be as helpful as possible," Josie Osborne said in a telephone interview late yesterday.
Coast Guard vessels and search and rescue aircraft had searched into the night for survivors.
"Their looks tell the whole story," he said by phone from Tofino. "You can't describe looks on people that are lost. They look totally lost -- shocked and lost."
John Forde, who runs The Whale Centre, another whale watching operation, responded to the call for help and was told the search was for four or five missing people.
The ship that went down was operated by Jamie's Whaling Station, Forde said. He said he had no idea how it could've sunk.
Forde said Jamie's Whaling Station was one of the first of its kind off Vancouver Island and had been around for many years.