Author Hugh McCormick Smith (1865–1941) William Converse Kendall (1861–1939)  
Description
English: Scotch Lake Trout; Loch Leven Trout
Subject: Lake trout
Geographic Subject: United States--Yellowstone National Park
Tag: Fish
Date 1922
Source/Photographer
English: Smith, Hugh M .; Kendall, William C. (1922) Fishes of the Yellowstone National Park : with Description of the Park Waters and Notes on Fishing, Report of the United States Commissioner of Fisheries for the Fiscal Year 1921, with Appendixes, Washington, DC: Government Printing Office
Source: https://commons.wikimedia.org/wiki/File:FMIB_35060_Scotch_Lake_Trout;_Loch_Leven_Trout.jpeg

Lake trout (Salvelinus namaycush) is a freshwater char living mainly in lakes in northern North America. Other names for it include mackinaw, lake char (or charr), touladi, togue, and grey trout. In Lake Superior, it can also be variously known as siscowet, paperbelly and lean. The lake trout is prized both as a game fish and as a food fish.