The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
And my decision to use this fly was simply based upon what was in my box
Gary L., so I don't have to misspell his last name, had a great scientific reason for why the Royal patterns have withstood the test of time. I bring it up in school as my integrated fly fishing story approach to learning. If it interests anyone I will give the reason.
Red is the first color to be filtered out in low light conditions, or in murky water with lots of particulate in it because of the long wave length can't penetrate as well.
However, the problem with LaFontaine's "Theory of Attraction" regarding color is that it's built on the premise that the most visible color in a given situation is the one the fish will prefer. I don't think the fish "see" it that way.:)
but Rock Creek has a decent population of Dicosmoecus (Fall Caddis) that happen to come back to the river for a drink or to oviposit precisely at that time of year