Fall is trophy fish time, but it can also be the most challenging and perplexing season of the year for most anglers. Why? Because so many factors are changing so fast and so dramatically. Think about it: We enter the fall wearing T-shirts while we fish in glorious weather conditions, catching walleye, bass, muskies, pike, perch and crappies; then a few short weeks later, we’re bundled up in parkas as we head out onto the ice. If you understand how environmental factors influence fish behaviours at this time of the year, however, you can use that knowledge to your advantage to catch more and bigger fish.