Monterey Bay Aquarium's West Coast Seafood guide suggests Avoiding:
Chilean Seabass/Toothfish*, Atlantic Cod, Imported King Crab, Dogfish*, Grenadier/Pacific Roughy, Caribbean Imported Spiny Lobster, Monkfish, Orange Roughy, Trawl-caught Rockfish*, Farmed, including Atlantic Salmon*, Sharks*, Shrimp - imported farmed or wild-caught, Sturgeon*, Caviar -imported wild-caught, Swordfish* imported, Bluefin Tuna, due to overfishing or farmed/caught in ways that harm other marine life or the environment!
Tuna, canned light Albacore*, Tuna: Albacore, Bigeye, Yellowfin(longline-caught)*, US caught Swordfish*, Rockfish (hook & line caught from AK or BC)*, BC caught Dogfish*, and of course wild-caught Clams and Oysters*
Clams and Oysters are concerns for neurotoxins from red tides at certain times, and other environmental poisons and bacteria due to human pollution in certain areas.
Yes, those beautiful fresh Albacore and Yellowfin are high enough on the food chain to collect mercury. I also understand Ling Cod should not be eaten hardly at all due to mercury. This from another test source, lost for the moment...