Grandpa, I may be wrong, but I think that 100% of the WDFW Hatchery steelhead are supposed to be fin clipped. Clearly the Indian hatcheries present a different story and there are enough Indian hatchery fish to add up to a sizeable percentage of the total - probably upwards of 10 - 15%.
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"You're not a g*dda*n looney Martini, you're a fisherman"

R.P. McMurphy - One Flew Over The Cuckoo's Nest