"Quite frankly, we were surprised at just how off base Dr. Oz was on this one," NFi said on its blog. "Getting in bed with environmental activists to gin up a scare story is one thing, but contradicting FDA advice, ignoring the American Heart Association's suggestions while confusing and conflating recreational fish studies with commercial consumption is beyond sloppy."

The trade group sent a letter to the doctor's producer.

"By overstating the risk from methlymercury in commercial seafood, is Dr. Oz engaging in the sort of scaremongering that will steer people away from eating fish and eventually result in more harm to Americans than good? I urge you to address and correct this issue on the air and on the Web with haste before more detrimental misinformation is propagated," said the letter from NFI spokesman Gavin Gibbons.

Click here to read the full letter.

NFI