There is a great deal of misconception regarding the hatching of aquatic insects. For example the hatch often referred to in hatch charts is actually when the flies emerge into adults. The actual hatch has already occurred prior to that time. However, for purposes of this article, we will use the standard term for hatch meaning when the flies emerge. It should be noted that insects spend most of their lives as nymphs, pupae or larva. Therefore the trout have far greater opportunity to eat them prior to their emerging. After they emerge as adults, they soon fly away.
Most aquatic insects crawl from the faster water to the slow or moderately flowing water to "hatch". Therefore the best way to fish a hatch is just before the hatch takes place and to fish in the slower moving water. Always use the best imitation of the insect and the best presentation. For a more detailed explanation please refer to class 3021 "Correctly Matching the Hatch" at Troutprostore.com.