We saw some pots like that on a pier in San Diego a few weeks ago. I also left a sardine and 1/4 pound sinker snagged on one just off Point Loma I think.
These boats were by the pier, but I think most are commercial tuna boats.
Also! I'd have won the boat jackpot were ling cod in season. That *is* a look of disdain from me. I'm too used to MT stocker rainbows and want nothing to do with teeth like that.
I've fished Oregon once at Depoe Bay a long time ago and we caught quite a few more ling cod and could've kept them all at the time. I'm starting to think that maybe some trip we'll go out that way and try it again.