My sis and I grew up eating lots of tuna since we could eat solid food and we never had any problems and checked out fine physically. However, that was 20 years ago and the mercury levels in fish might be higher now.
yep, I grew up eating a lot of tuna and a lot of salt grilled mackeral (my favorite fish). I hear that mackeral has a lot of mercury...but I think that the health benefits of eating oily fish outweigh the mercury. I am always hearing that you should eat "blue fish"...basically fish that are oily.