From ConsumerFreedom.com;

"A study published in the Lancet, an international medical journal, decisively demonstrates that there is nothing to fear from trace levels of mercury in fish. The Lancet study intensively examined women and their children in the Seychelles islands -- where they eat fish with the same levels of mercury as the fish consumed in the United States. But they eat about 10 times as much fish as the typical American. They consume fish an average of 12 times a week, and, probably as a result, have about six times as much mercury in their bodies as the typical American. Nevertheless, lead author Gary Myers says: "We've found no evidence that the low levels of mercury in seafood are harmful." "

I've got mercury in my tooth fillings, mercury in the house thermosat, mercury in the gas meter, heck I used to play with mercury when I was little. They put that stuff in everything, from tin cans to hemorrhoid cream.

I'm certainly not going to worry about trace amounts in my fish.