Although a fly doesn't vibrate, it does create enough of a distortion in the water that fish can pick up on. I believe it would be picked up through the lateral lines.
I didn't fully understand just how sensitive the fish's senses could be until I fished black Sluggo's on a moonless night. There was no available light to give the fish any visual cues, but they were still able to find and strick the lure. even though the vibrations are minimal at best.
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