Schwic: I generally just move on and say nothing. I've learned saying something to someone who is deviant enough to snag fish is a waist of time breath anyway. But I disagree with your speeding/no helmet analogy. Someone who breaks the law on the highway is not around very long. The river environment is much more intimate and those that choose to break the law there are intruding on YOUR space too. Much like a loud obnoxious jackass in a movie theatre or a restaurant in which you've paid your hard earned money to be present for a period of time.

Report these people if you have cell coverage. Just use the poaching number in the regs.