The trout is prized as a gamefish because it’s picky. It’s selective. Often, it requires a refined presentation to fool a wild trout. And in large part, that’s the draw toward fishing for them. In every region, in every stream, trout habits can differ from others in neighboring watersheds. And across the fishing landscape, we find places and even moments when trout are more picky — more choosy — about what, where and how they want to eat their food. We’ve all seen fishing change in just a few...