I agree with Jim there. Just ain't nothing you can do about sometimes. Best bet is to move the fly with extremely slow and long strips. As slow as you can stand it without hanging up on the bottom. Slow and steady. You will either feel heaviness or pecking on the line and there they are, but you'll still miss a lot. Depending on how deep the place is you can even count to about 5-10 then as you retrieve it it will rise slowly as you pull it. Bass like to chase but gills love to hit it on the pause. Hope that helps.
HOSS