Todd,
I've seen "steelhead" for sale at the local QFC that were obviously pen-raised rainbows (short and fat) but they were described as such, i.e. "pen-raised steelhead". Gawd, I can't imagine what they'd taste like. I haven't seen many fish in the markets with clipped adipose fins, but then I don't think that very many of the fish sold locally are locally caught. Are Alaskan hatchery fish fin-clipped or do hatchery fish form a significant portion of the Alaskan catch?