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A lake trout (Salvelinus namaycush subsp. siscowet) that has a large amount of body fat and is found only in Lake Superior.

[Short for Ojibwa pēmitēwiskawēt : pimitēw-, oil + iskawē, to have flesh of a specified type.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The main lake, rife with siscowet and giant lake trout, is no place for smallmouths.
Some such intraspecific twin forms have been identified independently as dwarf and large perch Perca fluviatilis (Alm, 1946; Svetovidov and Dorofeyeva, 1963; Oliva et al., 1989), normal and giant tigerfish Hydrocynus vittatus, lake charr and siscowet, Salvelinus namaycush, sea trout Salmo trutta and brown trout Salmo trutta morpha fario, and the deep bodied precocial form of Carassius and dwarfed altricial morph humilis (e.g., Balon, 1977b, 1980).
Maternal transfer of organochlorine compounds in Lake Superior siscowet (Salvelinus namaycush siscowet) to their eggs.