What do you think should have gone from 5WT to 8WT maybe. He was bigger than the boat i was in.

I prefer a 10wt myself, you might need to horse him in .

Seriously though, I once had a coastal bottle-nosed dolphin steal a rainbow runner I was playing on an 8wt, managed to break him off before he create havoc. I've also had dolphins regularly steal tuna caught on trolled lures. Cute they may be, accomplished fish-robbers they certainly are. Smaller than killer whales, perhaps, but still huge for fly-gear!