Here's a topic to throw around awhile, if any of you care to share knowledge. Let's pick a river, doesn't matter which one, can even be unnamed but here's the rules. It can't have any man made barriers on it, and no impassable fish barriers ie, tall falls, too low spots, fences etc in the majority of its length. And its mostly native steel, except for a few strays. My question is on steel behavior. From what I understand with hatchery runs they generally return to where they are dumped, if I'm correct, or reared. But what about natives? Do the majority head as high on the mainstem river as possible? or branch off to tribs, or just find redds that suit them along the river? Is spawning water level based? as in lower levels are better? I'm just wondering if I am learning a river with natives for catch and release am I looking at the majority of the river as where they will push through and only the upper reaches as suitable for spawning? I don't want to fish over spawning grounds, but also don't want to end up to0 high and fish where there are no fish. Any past experience on native run rivers that anyone cares to share?