Quack my good man...do a little resreach too and don't make attempts to stray away from the issue.
Regarding mercury in fish, especially pelagics, it has always been around, believe it or not. 17th, 18th and 19th century writings and research show many pelagic fish already had pretty high concentrations of mercury. Mercury is obviously a naturally occuring liquid (metal) element and for whetever reason has always ended up in fish. Yes, the problem has been made worse by pollution.
I for one can tell the temp sticking out my tongue as I have been a kingfish dip addict for many years.
Cheers and I stick by my email.
J