12:39 PM: The photo was shared by Amanda, who says:
This fish was sitting outside of Sunfish on Alki. Owner said it was caught right in Puget sound waters this morning. Amazing!! … Ironically, it’s actually a sunfish (the restaurant’s namesake). Normally this is a tropical fish, so the owner wasn’t sure why it was in the Sound. It’s not an edible fish, so it’s on display outside his restaurant.
That’s Amanda’s fiancé Kelby Schrock with the sunfish. A bit of online research suggests these fish do turn up in Puget Sound from time to time.
4:42 PM: Thanks to Owen for finding this Seattle Times (WSB partner) item with more information about the fish and how it got to Alki – in short, it was bycatch while a Muckleshoot tribal fishing boat was pulling up its salmon net.