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We reviewed the literature pertaining to Brook Charr thermal habitat, one of Fry's original species used in developing his scope for activity, to determine what guidance may be established for defining thermal habitat from the literature. The literature was surprisingly large, with 53 publications estimating Brook Charr thermal habitat. The laboratory-based optimal temperature estimates varied widely but were far more consistent when only acclimation-controlled studies were considered. Acclimation-controlled estimates of optimal temperature matched the peak of the aerobic scope curve published nearly 70 years ago. Confidence in defining optimal thermal habitat is strengthened for Brook Charr based on this match because the peak in aerobic scope has strong mechanistic links between physiology and thermal ecology. However, laboratory-based studies used only sub-adult Brook Charr and may underrepresent Brook Charr thermal habitat in nature due to ontogenetic differences in thermal preference. Optimal temperature estimates from aerobic scope or acclimation-controlled studies should be used to define thermal habitat boundaries for fish but should be treated with caution if based on sub adults. Population level sampling is needed to determine the generality of these literature-derived boundaries among Brook Charr populations.