Because often searching patterns are used before you know what specific hatch the fish are on. As the hatches kick off through the day, the trout will often get very keyed onto a specific insect, and unless you know exactly what that is, you’re going to quit catching fish, or as many fish. That’s why he said he started with a general searching pattern (dragonfly nymph) available at all times as a food source. If he can dial in his fly to what those fish are looking for specifically, he’ll catch way more fish throughout the day.

courses.anchoredoutdoors.com/courses/chironomid-fishing-with-brian-chan