The author interviewed in this piece is the subject of a recent Frontline: The Fish on My Plate.

http://www.pbs.org/wgbh/frontline/film/the-fish-on-my-plate/

It's about his experiment of eating fish as his only protein for a whole year, as well as an investigation of where our fish comes from, fish farming practices, sustainability, etc.

Aside, it may be a good thing Americans don't eat as much seafood as the rest of the world. I'm not sure the oceans could keep up with the demand. Allegedly very few fisheries are well managed.