Here is some good info from serious eats
A good portion of popular seafood consumed in America is listed in the red category, including Atlantic Halibut, Bluefin tuna, Imported King crab, Atlantic or farmed salmon, octopus, and freshwater eel. Some of the most popular sustainable choices include U.S. caught Albacore tuna, Alaska wild salmon, and U.S. farmed shrimp.For better choices, here are some steps you can take:
1. Ask the chef.
2. Reference your guide.
3. If you're without the guide, text "FISH" and the species name to 30644.
4. Visit fishphone.org to view a guide on your phone.
5. Then, at home, visit any of these online guides, provided by Blue Ocean Institute,Environmental Defense Fund, and Monterey Bay Aquarium.You can order the print guides to be mailed, but you will also be able to view the updated listings online as well. I recommend getting the print version—they're perfectly sized for the credit card slot in your wallet, and your friends will clearly see how serious you are about your sushi.