FLY FISHING DEVON: HOW DO TROUT SEE TO EAT SURFACE FLIES
This is one of the more intriguing parts of dry fly fishing and how to approach rising fish. The cone of view is not just relevant to how the fish sees the fly/insect, but also how that fish can see you, your rod and zipping line at times. The deeper the fish is the bigger the cone of view to the surface and to the sides (consider your rod tip and upper body as potentially visible). This is why you will see fly fishers often depicted as crouching stream/lake side to avoid detection via their movements. Truly, the beginner will learn over time as fish are spooked. Eventually, a holding/cruising fish will challenge you to slow down, reconsider your presentation and hold your breath.
SwittersB & Exploring 