1. Buy: Wild Alaskan Salmon.
Avoid: Atlantic Salmon (all fish with this label are farmed - most often in questionable conditions).
2. Buy: Domestic Shrimp from Oregon or the Gulf of Mexico.
Avoid: Imported Shrimp (90% of shrimp sold in US is imported, farmed, and possibly full of contaminants, antibiotics and cleaning chemicals).
3. Buy: American or Canadian Albacore Tuna (caught young; doesn't contain as much mercury).
Avoid: Atlantic Bluefin Tuna (highest level of mercury in any seafood; over-havested).
4. Buy: Alaska King Crab (always ask where King Crab comes from - it is often mislabeled).
Avoid: Imported King Crab (most is from Russia where it is not sustainably harvested).
5. Buy: Pacific Halibut, Catfish or Tilapia (sustainably farmed for now).
Avoid: Atlantic Flounder, Sole, Halibut caught off Atlantic coast.
6. Buy: US hook-and-line caught haddock.
Avoid: Chilean Sea Bass (most are illegally caught; highly contaminated in mercury).
7. Buy: Pacific Cod (one of Food & Water Watch's Best Fish Picks).
Avoid Atlantic Cod (currently one step above endangered).
8. Buy: Domestic Farm-Raised Catfish.
Avoid: Orange Roughy (over harvested).
9. Buy: Yellow Snapper or Domesticated Catfish.
Avoid: Imported Catfish (90% from Vietnam, caught in antibiotic-contaminated water).
10. Buy: Atlantic or Pacific Squid.
Avoid American Eel (often found in sushi; highly contaminated with PCB's and mercury).
11. Buy: Pacific Halibut and Atlantic Mackeral.
Avoid: Shark (destroys the food chain, high in mercury, cruel use of fins in soup).
12. Buy: Lake Sturgeon or American Hackleback/Shovelnose Sturgeon Caviar from the Mississippi River System.
Avoid: Beluga Caviar (over-fished).
Paul Greenberg states in his book, American Catch, that 90% of all seafood eaten in America is imported, and that 79% of our Wild Alaskan Salmon is exported. No wonder it's so hard to make a good choice.
*http://www.prevention.com, "12 Fish to Stay Away From," by Emily Main.