You are a "pescatarian". I used to follow the energy level eating practice - eating things lower on the energy scale http://en.wikipedia.org/wiki/Ecological_pyramid
(which is dependent on how much natural or fossil fuel energy is requried for them to be farmed, harvested, whatever). Being a pescatarian is pretty good as far as that goes. BUT - check this out!!!
That webpage gives recommendations on which fish are best to eat, and which destroy our oceans.
I now eat meat regularly, but follow a strict diet that focuses on local farming, organic farming methods, and sustainability. So I still focus on the energy pyramid thing.
AND... this is totally legit. I am getting my PhD in ecology... I vouch for these concepts.