Bluefish are all around the world; here along the Chesapeake and the Outer Banks of NC they’re greatly prized, and quite a challenge to anglers. I’ve never seen them in a store, only when somebody has gone out and caught one :-):
https://en.wikipedia.org/wiki/Bluefish
So you have not eaten it.
It seems bluefish do not choose to hang out in California waters. That fisherpeople say the climate would be ideal but yet there are not here.
They may be smarter than us humans.