Yep, big issue in news a couple of month ago. Basically it's the larger predatorial fish such as shark, other fish and tuna were included. They say that the albacore tuna has less of mercury in it. It is the smaller oceanic fish that have lots of mercury, like sardines and shit from Moracco and waters like that. Big fish eat little fish and that's were tuna can have problems. Its from rain water and runoffs, not nets. I believe its the FDA site that has consumption limits. It basically boils down to 5 cans a week. But that is for the average person whom may have other health problems where mercury could be a problem. Yes, it effects the nerves. How it relates to muscle, I didn't read on that. Shit I eat about 10 cans a week and I'm alright. So, eat your frickin tuna. Lot of other shit to worry about. You can wear you gloves and respirators and eat the earths purest foods and your still gonna die someday.
Juice on!