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Greeting to everyone,
I often look for opinions across a broad spectrum of experienced fly anglers to get a better sense of what may or may not be important regarding our sport. Recently, I was shown an online article regarding the creation of gas bubbles on hatching caddis. LaFontaine mentions this phenomenon in his book Caddisflies. Vern Hidy also thought is was important in fishing flymphs to dry off the fly between casts to create a "hydrofuge" (a bubble of air trapped) on the fly.
I am aware of certain species that trap air to swim to the bottom to deposit eggs, but this phenomenon occurs during the emergence of the caddis. I will post a link to the article. Some of you may have seen it, before.
The photo that intrigues me the most is the one of the hatching caddis pupa with the air bubble. Up to seeing this photo, I did not believe this even occurred since I could find no evidence of it scientifically nor photographically.
One cannot tell from that photo whether the air bubbles are UNDER or OVER the pupal covering. Some aquatic organisms such as black flies harvest air bubbles from rocks and use the air to rise in the water column.
The question for me is whether the air is under the pupal skin which means it came from the pupa or whether the air is over the skin which means the pupa likely harvested it from underwater air bubble on plants and rocks.
03-15-2010, 10:17 PM
Troutastic
Re: Important or not?
Caddis aren't the only ones that trap air like that... I know that when midge pupae are emerging they trap air like that to help get them to the surface. People have been adding mercury glass beads on their midge patterns to make it flash underwater in a similar way that the trapped air would reflect off the sunlight. Or, on a buzzer pattern you barely lightly coat the fly to make it glossy all along the body to make it almost "transparent." Just my 2 cents...
03-16-2010, 06:00 PM
The fly fisher
Re: Important or not?
That's kind of cool maybe if you were to put some thread threw a clear glass bead and fold the thread in half then put the thread on the hook shank loosely and pull the thread until the bead is tight to the body it would look like a little air bubble. I would be kind of difficult to tie the fly after that though.
exactly like this http://i963.photobucket.com/albums/a...icBeetle-1.png
i found it on Google. i didn't tie it and wouldn't cover it in rainbows but it makes the point
03-16-2010, 06:08 PM
Troutastic
Re: Important or not?
What I meant was using the glass bead as a beadhead, opposed to the standard metal beads... but that is an interesting take as well...
03-16-2010, 06:53 PM
Mantis
Re: Important or not?
[quote author=xXFLYFISHXx link=topic=4211.msg33258#msg33258 date=1268776845]
i found it on Google. i didn't tie it and wouldn't cover it in rainbows but it makes the point
[/quote]
Hilarious. :) There's not much that I would cover in rainbows.
