This is probably the wrong website, but regardless I will post it anyways.
I am about to start taking my fish oil which is 1000MG which is 2 gels per serving, so I would be taking 1-2G per day. According to WebMD it is not safe to take more than 3G per day.
I also eat Grilled Salmon fillets on occasion which has 410MG of omega 3 if I read the label correctly. But my question is regarding Tuna Fish. I eat Chunk light (walmart) in water and usually 1 SS per lunch. I eat this on occasion. The label says its 56G, but I did not read anywhere where it says anything about omega 3.
The Pharmacist I spoke with did not know the answer but suggested a nutrition/food website for this answer.
This is what I know from one source but many others agree:
Researchers who tested cans, both oil and water types, reported that they all contained mercury levels higher than the recommended EPA limits for safe consumption. White, or Albacore tuna, registers the highest mercury concentrations.
If you still want to eat tuna, personally I would think the water variety would be a safer bet, but you might want to consider not eating too much of it.
I'm sure others will advise you differently but mercury is one thing I try to be aware of and stay away from. I think you said you also eat salmon, which I think is an excellent choice.