Flag of Canada (1921–1957).svgCanada
Name: Canadian Mariner
Owner: Canadian Government Merchant Marine Ltd, Canadian National Steamship Company
Operator: Canadian Government Merchant Marine Ltd
Port of registry: Flag of Canada (1921–1957).svg Montreal, Quebec
Ordered: March, 1918
Builder: Halifax Shipyards Ltd, Nova Scotia
Launched: September 4, 1920
Completed: November, 1920
Out of service: 1933
Fate: Sold
Civil naval ensign ([Hinmaru])Japan
  • Choyo Maru
  • Tyoyo Maru
Owner: Dairen Kisen KK
Acquired: 1933
Out of service: December, 1942
Fate: Torpedoed & sunk
General characteristics
Type: General cargo
Length: 399.3 ft (121.7 m)
Beam: 52.5 ft (16.0 m)
Depth: 28.4 ft (8.7 m)
Propulsion: Triple expansion steam engine

SS Canadian Mariner was a freighter built by Halifax Shipyards Ltd in 1920. She was the first steel ship built in Halifax and was used as a general cargo ship until she was sunk in the Pacific in 1942.

Early life

The Canadian government commissioned the building of 63 ships in 1918 in an effort to start a crown funded shipping company, Canadian Government Merchant Marine Ltd. Canadian Mariner was built as the result of the two contracts awarded to Halifax Shipyards Ltd by the Canadian Government. The other contract was for her sister ship, SS Canadian Explorer.[2]

Transfer history

In 1928 management of Canadian Mariner was transferred from the failed Canadian Government Merchant Marine Ltd to Canadian National Steamship Company, which she steamed under until 1933 when she was eventually sold to Dairen Kisen KK of Japan[3] to be used as a general cargo and supply vessel for the Japanese occupied Pacific Islands under the name Choyo Maru.


On December 28, 1942, Choyo Maru was sunk by USS Kingfish off the northwest coast of Formosa, at position 24°46′N 120°40′E / 24.767°N 120.667°E / 24.767; 120.667Coordinates: 24°46′N 120°40′E / 24.767°N 120.667°E / 24.767; 120.667.[4]

Partial list of voyages

  • December 8, 1920 : Halifax to Genoa
  • June 16, 1921 : Montreal to Liverpool
  • July 23, 1921 : Montreal to Australia[5]


  1. ^ Lloyd's Register 1920/1921.
  2. ^ Mackay, Mac (December 15, 2011). The Ships of the Halifax Shipyard.
  3. ^ Swiggum, S. (2014). "Canadian National Steamship Company". theshipslist.com. Retrieved August 3, 2014.
  4. ^ Cressman, Robert J. (2000). The Official Chronology of the U.S. Navy in World War II (1942). Naval Institute Press. ISBN 1-55750-149-1. Retrieved August 3, 2014.
  5. ^ Canadian Railway and Marine World. Toronto: Southam Business Publications. 1921. Retrieved August 3, 2014.