[briansnat]

I've seen a a dozen or so while fishing, mostly from a boat. Only once while I was stream fishing.

I never had a "run in" while fishing. They tend to go the other way when they notice you. But if you do encounter an aggressive one, do not run, even if they charge (it's usually a bluff). Back slowly away while talking calmly. Make yourself as "big" as possible, for example if you have a net and rod, hold them out so you look larger (they have pretty poor eyesight). When you get to the car, change your underwear.