Don't know if any of you know this already( I didn't). Learned this unique fact from well known Mike Mercer at the only prentation he does once a year. Aquatic insects, at a certain time if the day or night, stop their wandering of the river bottom and most insects of that species let go and float downstream to look for more food, mainly Mayflies and a few other migrational insects like Stoneflies, Midges,ect. It is called Behavioral drift. So if one area in a river didn't have that many insects other insects would float downstream to re-occupy that area. This is important for a fish because all of a sudden after slurping a few insects here and there, these trout see a food truck float right in front of them, and that=chow time! Just some cool info. Tight Lines, Kaden S.