I let four hatchery fish go on the skagit saturday simply because I didn't have a need for them. Normally I keep them but this past year I got 50+kings plus countless silvers. I give a lot of fish away and eat even more but my freezer is pretty full and I don't think I have a need for more. During years with low returns (like this) it makes it that much easier for me to let one go. As for keeping a fish for crab bait I've never done that. If I need bait then I'll just freeze a few heads and backs.