Clarke and Goddard explain how the parts of the fly that are seen in the window merge with the parts that are on the film as naturals and artificials approach and enter the window. To illustrate the concept, they use an up-wing pattern, specifically the mayfly because the mayfly wing being an up-wing is visible earlier in the window.Silver,
You say that trout can see color. Also, In the first link you posted as a reference (How does a trout catch a fly?) about a quarter of the way down, which mentions the following;
"Therefore a trout has two cues that an approaching object may be edible:
1. body parts that break through the 'mirror'
2. wings appearing in the window
The next diagram shows what part of an insect are visible as it drift downstream towards a waiting trout.
At first only the legs are visible beneath the mirror ( ^ ^ in the diagram)
then as the insect gets nearer, the trout can see more and more of the fly's wings in its window ( 1 and 2 in the diagram below)
finally, when the insect reaches the edge of the trout's window, all of its body can be seen (3 in the diagram below)
Wings maintain the trout's attention on the fly as the fish rises towards the surface to intercept the fly."
Should we pay attention to the color of the post on say a parachute dry fly? Is it appropriate to assume that a colored post may not posses one of the cues a trout uses to determine if the fly is edible?
I would appreciate your thoughts on this. I also get that for some of us and for the small size of some of the flies we fish, our ability to see the fly may override the need to make that fly look more edible and that a smaller size may eliminate a trout's ability to see the post.
Thanks Silver!Clarke and Goddard explain how the parts of the fly that are seen in the window merge with the parts that are on the film as naturals and artificials approach and enter the window. To illustrate the concept, they use an up-wing pattern, specifically the mayfly because the mayfly wing being an up-wing is visible earlier in the window.
Before we can even discuss whether wings are important, we need to back up one step and decide whether shape is important. Since the wing profile of a mayfly is a major part of the shape of a mayfly, if shape is important, then the upright wings of a mayfly must be important. So for an adult pattern (subimago or imago), I believe that the wing is a necessary part of any imitation.
To address the specific question about the color of a post on a parachute fly, I believe that a parachute fly is NOT an imitation of an adult mayfly. The hackle being above the body means the body of a parachute is in the film. Also the post of a parachute is not the shape of a mayfly wing. I believe a parachute fly is a emerger imitation.
What the post represents is the emerging wing and body before the wing expands by being having their wings pumped full of liquid. The post represents the amorphous shape of the emerging body and folded wings.
I am not sure what the actual color of the emerger is at each mini stage of emergence. Emergence is a continuum and I would be surprised if the color of the emerging body/wing complex was the same color as the adult mayfly wing at all times.
So my practical way of dealing with this conundrum was to either use a white post, or a light grey post, or a post that is the about the color of the adult mayfly body. Quite frankly, I don't know that it has made much difference. Now I use a white post since it is easy to see but I have seen optic yellow and optic pink posts on some patterns. I don't use these colors myself.
As for the wing of an adult pattern, I do try to match those for color. When I do not have the color close to the natural, my strategy has been to use grey about the same shade as the natural wing. My theory here is that if the color is not right, at least the shade (the amount of grey reflected) is about the same as the amount of color reflected from the real insect wing.
When fishing small flies or flies that sit low in the water such as ant patterns, I use a bit of strike putty (Biostrike) that is place about 18" from the fly. That is my proxy for the fly. When it drags, I pick up and recast. When there is a rise that could be to my fly, I strike.
Understood... a still somewhat immature adult yet to sprout full wings and fly away. Thank you for your insight Silver!I do think the post on parachutes are visible in the window before the body enters the window. Trout have poor vision so I suppose they could take them as wings early on before the entire fly enters the window. I am convinced that when the fish sees the complete parachute fly lying in the film and the post above, it takes it for an emerger rather than as a completely emerged dun.