I have seen this many times in the past. I am not sure exactly why fish do this, but I have some theories.
Theory 1 - Could the fish be trying to just smack the fly with it’s fin. I think in this case, they may not know exactly what your popper is, but they think it is something they want to eat. So they go up to it and smack the stuffing out of it and see if they can kill it BEFORE eating it.
Theory 2 - The popper is just to large for the fish to eat. I have seen this MANY time with bluegill!!! They can be so agressive at times that they will try to eat ANYTHING!!! If the fly is too large all they are doing is hitting the side of the fly and not getting it into their little mouths.
Theory 3 - Fish have no eye lids, and the time right at dusk, I think, is hard for them to see well. My reasoning about this is simple. If doing night fishing, your eyes have adjusted to the natural light (night vision,) and your turn on a light and shine it into your eyes. How long does it take for you to get your night vision back? For most people I have seen and been around, they would say it takes a LONG time, sometimes in the range of 30 minutes to an hour!!! With this in mind, the fish’s eyes having been looking into a bright light ALL day with NO eyelids to help them. During the last 30 minutes of light, they may be having a really tough time seeing flies do to the fact that they are trying to have their eyes adjust for the upcoming night time.
With all of that in mind, in the last 30 minutes of light, I find fish can feel, smell, and hear food a lot better than they can see it. With fly poppers, they can hear it, but they have trouble seeing it. Therefore, you have a lot of “off center” hits on them during this time.
I think theory 3 may be the most accurate myself. This comes from my old rod and winch days of bass fishing. During the last bits of light, when the wind calms and the water settles, I would always reach for a nice buzz bait. The buzz bait is a spinner bait with a special spinner that claps the water when retreived. You simply casted the lure and reeled fast enough to keep the lure on top of the water. To me, the noise it made on the water gave the bass something to key in on and made their “accuracy” of finding the bait ten fold!!! I have talked with a lot of people in my time, and in the last 30 minutes of daylight I was not alone in my lure selection.
With a fly popper, a fish doesn’t have the constant noise being made to help the key in on the actuall flies location.
With all of this being said, take heart in the fact that you are not alone!!! Here are a few thing I have tried and have found to work!
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Move the popper in a little faster retreive trying to actually move the popper as little as possible. I know this sounds weird, but all you want to do is to make the popper work with as little line strip as you can use. I have found that using the rod tip instead of line stripping to make the popper work is rather effective!!! You can use a 1 inch pop of the rod tip to create the same amount of “pop” as you could from strippin in 6 inches of line to do the same thing!
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You could use a slightly smaller sized popper. Or, if you make your own poppers, try to make on with a large mouth end and tapering the body very quickly to the hook. Make the body look more like a triangle as compared an oval shape with a flat mouth.
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Try using a double fly configuration! Use a surface popper with a small clouser under it about 12 - 14 inches! This is great if you tie you own flies! Make the clouser about the same length as your popper, maybe even a little shorter. Use very little weight on the clouser, just enough to get it down without draggin on the popper. Also, having a clouser the same color combo as the popper works wonders!!!
These are just my thoughts, so please be if anyone out there thinks my theories wrong, please let us know!!! I am not a scientist, just a person that loves to fish!
Sincerely,
Reg