Well, now, maybe this can “stir the pot” a little and also give me an answer, that’s puzzled me for a long time…
Fishing the upper St.Joe river in North Idaho last year, we were after West Slope Cutts. We’d spotted a small grouping of 5, that lay at the base of a small white water area. Obviously, at about 17" average length that we could easily see, these fish hadn’t grown to that size, “being stupid”.
So, I switched reel spools and put on a CLEAR Monic brand floating 4wt. line. ("I’d had on, a subdued colored, AirFlo line, in “moss green”.).
First cast up to the fish, the line as planned, stayed well below the fish in question and the only thing to reach them was a #22 Trico and 12’ of leader.
The fish scattered like we’d thrown rocks, into their pool.
We rested the spot, for over an hour and watched as the trout slowly returned.
I switched back, to the AirFlo moss green line, while we rested the pool. Same fly, same leader. Bishop had kept on his peach colored 555 line the whole time.
We fished, again, and it took some effort, but we hooked and released 3 of the 5 trout, in about an hour's time. Naturally, being the EXPERT that I AM.......... I screwed up and bungled more casts, during that hour than I ever made good ones, I'm sure.
But, the lines, we used, never seemed to spook those large fish one iota. We, accidentally lined a couple, no sweat, they didn’t even budge.
I became more curious about this “Monic clear as glass fly line” I’d been given to test out,so again I put it on my reel. One cast, and again the fish scattered like before, the second that line hit the water, WELL BELOW where they all laid!?!
I worry about “where my tippet lands, along with the fly”, and no longer care, what color my lines are.