We've all heard that Salmon is packed with great inflammation-reducing Omega-3 oils, so I'm sure sales have skyrocketed. The thing, though, is that because of the diet they are getting, the farmed salmon, aka Atlantic Salmon, has developed a higher level of inflammation-CAUSING Omega-6s. It's not horrible stuff, we just need to be careful about how much we eat of it. The Wild stuff? Still stellar, giving you a better ratio of Omega-3s to Omega-6s.
For other fish tales, visit http://www.montereybayaquarium.org/ It's a great resource and will tell you which fishes (yes, you can pluralize fish as a species) are dangerous, which are not, which are endangered, you get the picture.