Native Chinook salmon Oncorhynchus tshawytscha and non-native brook trout Salvelinus fontinalis prefer similar water temperatures.

Preferred water temperatures and acute temperature tolerance limits of two salmonids in California were assessed: juvenile Chinook salmon Oncorhynchus tshawytscha, a native anadromous species, and sub-adult brook trout Salvelinus fontinalis, an introduced game species. These two species preferred similar temperatures across an 18 h temperature preference experiment and showed similar critical thermal tolerance limits, suggesting a substantial thermal habitat overlap in the wild.