from Instagram https://instagr.am/p/CXJVljRlY05/ via IFTTT
UPDATE 2023:
Also: when this was posted to Facebook several people commented that this fish was particularly unusual. And asked what it was.
I did not know.
My friend Susan posted to inaturalist soon after. The identification that folks agreed to was: Specklefin Midshipman (Porichthys myriaster) a fish that is rather unusual to find in the San Diego area. It was very satisfying to get an ID for this fish.