Don't become a pollster for a carrear, and I will not be a professional speller. I had to vote Dams due to the Columbia, Skagit, Green, Cedar, and anything else with a dam. That said, Todd sumed up everything else. I think commercials and tribes do there damage, but are predominatly hatchery stocks, I don't think hatcheries play as large a role as some think. Finally, bad environment, what are we possibly going to do about ocean conditions, especially in the short term.
A better question on those might be which has the least impact on Salmon, I would have to say HONEST sportsfisherman, because we know that poachers are not honest or sportsfisherman.

NEN