I have been through this with WDFW before. Their perception was that you are landing fish back in Washington so you have to meet the requirements of that port or state law.

Tuna is what brought this up.
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Join the Puget Sound Anglers Sno-King Chapter. Meets second Thursday of every month at the SCS Center, 220 Railroad Ave. Edmonds, WA 98020 at 6:30pm Two buildings south of the Edmonds Ferry on the beach.