Barramundi is awful, as is Mullet. Don't eat pelagics, except Wahoo. Tailor is off my list with Trag Jew as well. But, the worst eating fish is any fish with the word "COD" in its name. For some of them, it's a case of boil them in a pot of battery acid for 3 hours with 2 rocks and, when it's finished, throw the fish away and eat the rocks.
Cheers,
BIGNICK.