A veteran guide breaks down the 5 most common nymphing mistakes costing Montana anglers fish — with fixes you can use on the water this season.

Choosing the right fly while fishing can be daunting, but a simple trick can help. Observing the aquatic insects under rocks near the riverbank provides insight into what trout are eating. By matching your fly to the size and color of these insects, you can improve your catch success.

Montana guide Tim Cammisa shares 4 practical fly fishing hacks for spring trout season on the Madison, Gallatin, and Yellowstone rivers.