Have fished at 10+ piers in SF bay this year all around the bay (although not much in the Delta) and many spots from shore, my observations on each (without really targeting these):
Kingfish: Never seen one landed.
Bullheads: Saw one large 10" floating and freshly dead by Golden Gate Fields in Berkeley. Not sure what happened to it, but not promising. Kept it frozen for bait. Never seen them caught by an angler.
Perch: Lot of shiners, followed by walleye, some dwarfperch and black perch.