I am not arguing the hypothesis, but would prefer a scientific basis rather than a peta-esque feel good warm and fuzzy answer. Cold water holds more oxygen than warm water, which is in line with temperature/oxygen sensor data. My suspicion is that there is a combination of factors at work here (temperature, metabolism rates, genetics, dissolved oxygen content, water quality - including the added chemicals from a weed kill, boating pressure, prey condition and availability all come to mind).

Rereading this, I am not critical of anyone here, nor am I critical of the concept. I just would like to see some research (I am so much of a musky nut that I would stay up at night reading it!).