If I recall correctly from discussions (way back) that the coho strays we saw in South Sound came from a variety of places. The biggest source was, of course, net pens. But what I remember the interesting part is that each hatchery stock went to rather specific areas. If you had Minter fish you didn't have Squaxin, even if Squaxin was closer. It was an odd pattern.

At that time, too, if memory serves, much of Squaxin fish came from Wallace River.