Here's what is going on in SE Alaska. Commercial trollers have a winter troll season in terminal areas that target alaska hatchery King Salmon. This same type of season in terminal areas goes on again in the spring. On July 1st is when they are allowed to fish anywhere they want and harvest treaty fish which are headed to BC and farther south. So to answer your question they do kill some Washington fish but so do the sporties up there. I have harvested Hatchery King Salmon up there that were destined for columbia river hatcheries and other places in washington.

All the data is available on ADFG website if you are willing to look for it.