Mercury free fish?

[Guest guest]

One by one the foods my son is able to eat are whittled down for one

reason or the other. I know I am not the only one who must get

frustrated from time to time....We eat fish once or twice a week.

Usually oven baked orange roughy or tuna (I use it instead of salmon

for Salmon Puff recipe). My son was recently shown to be high in

mercury and though I know that he received major doses with his

immunizations I now have a concern about fish consumption as well.

Is it possible to get fish that is mercury-free? Rosie