I spent an afternoon trolling in Lake St.Clair this summer; it's one of the Holy Grail waters for muskie fishing. The day we were out was in the middle of a blistering heat spell. Surface water temps were over 86F; five feet down it was still 81F. Most of St.Clair is very shallow, so not really any truly deep water into which the fish can retreat. Fishing was extremely slow, but we still boated 2 fish; would have expected a dozen under less extreme conditions. The two were quite sluggish on the line, and required so much time and care to resuscitate that we quit early for fear of overstressing the few fish willing to take a lure.
This doesn't really tell us anything about the species' ability to live in warm water (mid-70's) year-round. Those St.Clair fish were able to survive a period of at least a couple weeks of much higher temps...but would certainly be enjoying temps 30 or 40 F degrees cooler 6 months later.
This doesn't really tell us anything about the species' ability to live in warm water (mid-70's) year-round. Those St.Clair fish were able to survive a period of at least a couple weeks of much higher temps...but would certainly be enjoying temps 30 or 40 F degrees cooler 6 months later.