Author Henry William Herbert (1807–1858)  
Description
English: Great Lake Trout. Mackinaw Salmon. Salmo amethystinus, Mitchil
Subject: Lake trout
Tag: Fish
Date 1851
Source/Photographer
English: Herbert, Henry William (1851) Frank Forester's Fish and Fishing of the United States and British Provinces of North America, New York, NY: Stringer & Townsend
Source: https://commons.wikimedia.org/wiki/File:FMIB_44050_Great_Lake_Trout_Mackinaw_Salmon_Salmo_amethystinus,_Mitchil.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.