Not sure if this is common practice, but some 30+ years ago fishing with my grandfather, he used to tell me to gut one before tossing it in the cooler, see what was in its belly, *that* what they are eating right now. Seasonal bugs, worms, minnows, crawdads, hellgrammites, etc... IF you can find more of what they are eating right now, it works. I can personally vouch for that. But it is not foolproof, thee things were stuffed tot he gills with grass not crickets! If I had to guess they were seeking higher calorie food because the water temps are dropping slowly. mid 70s last week, predicted 77 for Christmas! None None dead I know of yet other than the ones I ate, if they make it 2 more months they should be clear for surviving winter.