Okay my lack of biology knowledge is showing...I guess what I am trying to ask is: Are what is being observed in Western Washington rivers resident steelhead or resident trout? There would seem to be a pretty big difference. If there are resident steelhead why not resident coho?

What is the current scientific consensus regarding the evolution of the steelhead? Did they evolve from a resident trout species? Kind of a chicken or the egg question I know...How do salmon and steelhead differ in their evolutionary history? How closely related are they?

Are there any Western Washington rivers that boast a healthy resident trout population?