Seafood Guide and Watch.

The Monterey Bay Aquarium puts out a sustainable seafood watch guide booklet. It recommends to avoid the following due to overfishing or harmful conditions-

Cod Pacific (imported)
Cobia (imported farm raised)
Crab King (imported)
Grenader
Lobster (Brazilian)
Mahi Mahi (imported longline)
Monkfish
Pacific Snapper/Rockfish (trawled)
Shrimp (imported)
Tilapia (Asian farm raised)
Tuna (skipjack, tongol, canned)

It goes on to say minimize the following consumption due to mercury levels-

California Halibut
Caviar Sturgeon (wild imported)
Chilean Seabass
Dogfish (US)
Lingcod
Marlin (striped pacific blue)
Orange Roughy
Salmon (farm raised including Atlantic)
Sharks
Swordfish (US & imported)
Tuna (albacore, bigeye, bluefin, yellowfin)

Visit www.edf.org/seafoodhealth or www.seafoodwatch.org
for more information.