SUSTAINABLE SEAFOOD: The Seafood Choices Alliances (Washington, DC) has unveiled the nation's best choices in terms of both taste and environmental impacts:
Wild Alaska and California salmon
American farmed caviars
Atlantic mackerel
US farmed catfish
Dungeness and stone crabs
Pacific halibut
Rainbow trout, farmed
Sablefish (black cod)
Clams, mussels and oysters, farmed

Good regional choices (not always widely available)
Nantucket bay scallops
Southern crawfish
Florida mahi-mahi
South Carolina wreckfish(of which I have never heard!)

And the five worst choices:
Beluga caviar
Chilean sea bass
Farmed Atlantic salmon
Orange roughy
Imported farmed shrimp

Interesting, is it not?