GOOD has a new transparency up: Which Fish to Eat?
The easiest thing to remember is first look for U.S. Farmed, then these species: Arctic Char, Barmundi, Catfish, Cobia, Tilapia, Rainbow Trout, Striped Bass (not ill tempered), Clams, Bay Scallops, Mussels, Oysters, and Spiny Lobsters.
They are not listed, but Crawfish are good and sustainable option too.