I commented on your other thread about cooking them into patties.
My general feeling about them is this - I cooked one once so that I could say that I did. Having done it, it's not worth the trouble to get a food product that's not any better than store-bought frozen salmon patties. If I was killing one anyway, I'd certainly cook it, but I wouldn't go fishing for them specifically for the purpose of trying to fill the freezer.
Another thought: I've never personally purchased these for a pond before, but I've been told that they can be pretty expensive fish (I seem to recall someone saying they were over $5 each). If that's the case, be mindful of killing them from a private body of water unless you have permission from the owner. Most of them are bought as sterile fish, so each one you see was purchased, and they can't reproduce.