Had the same thing happen at Westport earlier this month. The fin was partially clipped as well. The skipper was petrified of WDFW and showed me a chart that Sgt. Cenci of WDFW enforcement had given him.

It was amazing, it had drawings of various types of clipped adipose fins. ALL were clipped. The ones in Oregon were allowed to be longer but the Washington partly clipped fish had to be right next to the back. It was ridiculous.
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"I'm old and tough, dirty and rough" -Barnacle Bill the sailor