I think it's a new diet fad among trout. "Eat Fly-Free and Live Longer" I think I saw it on Oprah.
Seriously, though, I believe we have some stressed fish. Higher air temps, higher than average water temps, and fishing pressure are all active factors. I would say we will have one of two things happen before the winter. 1)A major fish kill resulting from the stress, or 2)Some really hard feeding frenzies, spurred by the drop in temps in a couple of months.
It would be interesting to note the general health of the fish harvested, though. are they sickly right now?