skates about like a paper airplane. Which is pretty much what a swimming adult looks like -they're buoyant, and pretty darn quick. The aggressiveness fish show in taking the fly tells me that the imitation is adequate and the fish have to move quick on the naturals.
Good info here Paul! I have watched fish during fairly heavy hatches of caddis and also during Hex activity...I think that they lose it, for lack of a better explanation. During these frenzied times the fish are geeked and I think a fly's behavior, as you have pointed out here, is more important than just about anything else...Within limits of course.
During these times if you can get your fly where its supposed to be (where the fish are seeing and taking them) and get it to act like the natural to some extent...Problem solved!
I watched a nice fish one day rooting with it's snout in to a muck bank for Hex nymphs. There was a large mud stain floating downstream from where he was working...In my opinion, just about anything floated by this fish at that depth would of been taken by him. At one point, and for no apparent reason, he stopped what he was doing to race to the surface and make a couple leaps from the water! A real feeding frenzy.
When their little brains are lit up like that anything floating by isn't safe...:) It can be really frustrating though to actually be watching all this activity and your fly not getting any attention...Been there! Done that! On-the-other-hand, if you have the right fly you will be walking back to the fishing wagon that evening with a big smile on your face. Those cold Molson's on ice in the cooler in the back of the truck couldn't taste any better! :)
Spence