Confused about which fish to buy?

I get crazy trying to remember farmed, wild, which kinds are high in mercury, which are endangered, etc. I found this really great website which explains (very thoroughly) environment and health issues surrounding species.

http://www.blueocean.org/seafood/

I keep their guide right in my wallet. Extremely useful!

I like to eat talapia...but after watching a show on tv I did not realize that it is a bottom feeder like a catfish....There was a pond raising stripped bass and they use talapia in the pond to keep the bottom clean....like the waste from the fish....It tastes great but now I am not so sure about it....