This The Joker fan art contains
atlantic herring, clupea harengus harengus, pacific sardine, sardinops caerulea, herring, and clupea harangus.
There might also be
red cabbage, skipjack, skipjack tuna, euthynnus pelamis, sockeye, sockeye salmon, red salmon, blueback salmon, and oncorhynchus nerka.