As much as I like fish, and though it is in general good for you, commercial fishing is emptying our oceans at an alarming and unsustainable rate. If humans keep fishing at the current rate, we'll have emptied the oceans of fish by some time in the later half of this century. We'll be left with jellyfish, worms and krill as our only seafood.
Do you want your grandchildren to eat fish? Only buy sustainably sourced seafood!
See the documentary "The end of the line" for evidence and info: http://endoftheline.com/