I've noticed, that many mayfly spinners ( I'm currently thinking PMD, but I
believe it applies to other species ) come in either a light olive, much
like the fully dried dun of the species, or various rusty shades.

Anybody know for sure, is this a boy/girl thing? the males one color the
females another? or what ? Just curious.

Last summer I rose a nice HFork trout on a #18 rusty spinner. Over eager,
I struck a tad too fast and just felt the fish a split second as I pulled it
away from the fish. I was amazed that he kept rising, but I could NOT get
him to take another rusty spinner and I got several floats that looked ok to
me. I switched to an light olive version, same size and pattern ....
'fish on,' first cast. I thought it was in interesting experience, thus I
share it G