Of all the options I must say that I think the fishhook idea is pretty disgusting. Please just shoot the bird if you are considering torturing it with encouraging it to swallow a few treble hooks. I would use a 12-gauge shotgun with steel shot. Don't brag about it at the bar. The fishing line idea sounds like a good one too. Great blue herons are beautiful birds and I hope I never see one choking on a $4 rapala. When in doubt: shoot, shovel, and shut-up. Sorry Pond Frog, I think that your idea is awful, no offense.
