Stick with the omega 3 and be careful with the amount of tuna you consume. It seems these little tuna fish went around swallowing mercury. I guess they like it. Some folks who ate a can of tuna for lunch for 2 months had mercury levels that were unhealthy.Moderation is the key. Now if you want some good fresh PCB'S, try stripped bass. It seem s they're loaded with them!
I never realized tuna had so much mercury. That's really too bad--especially because it's far easier to get tuna here in the USA (vs most other kinds of fish).
It does seem that PCBs and mercury can be major concerns with any type of fish, or even fish oil. In another post you mentioned some government information on mercury--that would be helpful if you could post a link (e.g. if it's available in a PDF, whatever).