With fish stocks under pressure, which are okay to eat?

Information was compiled from four main sources: the Monterey Bay Aquarium, the Marine Conservation Society, FishWatch, and the Greenpeace Red List. Individual entries have lists of sources, and I have aimed to reach a verdict solely based on the information contained in the sources. MCS ratings of 1-2 are considered "sustainable", and a rating of 3 is acceptable if other sources label the fish as sustainable.

Where there was serious contradiction, or the differences between sustainable and unsustainable sources of a fish was too involved, I have erred on the side of caution.

Mercury information is taken from the FDA Mercury table. Fish with a mean mercury PPM of less than 0.1 are considered low in mercury.

With some fish labeled unsustainable there will be exceptions where you can source them sustainably from specific places. To highlight these sources and mention updates, I've started a twitter stream at @which_fish.