Dan, if you fish Cluney Lake on Ft Rich you'll see these same worms in the belly flap of most of their dolley vardens. You can actually see the bumps on the outside of the belly. Interestingly, though, the rainbows from this same lake have very few (if any) worms. I fished Finger Lake last winter quite a bit, and I did not find any worms in those dollies or trout.