One thing that hasn't been mentioned (or it has but I'm too lazy to check) is this:
www.dep.pa.gov
It hasn't.
We all know that the PF&BC has consumption advisories on all inland waters. Whether you should eat, and how much. But what it doesn't say is that the fish you buy in the store are often as or even more contaminated with things like mercury or PCBs than what you can catch yourself.
I am really not discounting the advisories. Would I eat catfish or round goby out of lake Erie? No. Would I start eating steelhead every week (if I liked trout)? No. Would I eat perch or panfish from Pymatuning? Sure.
FDA only has one threshold for fish that is commercially sold. They do have advisories *which PF&BC uses, but they are not front and center, and most people are ignorant of this fact. But PF&BC can only advise on fish you can catch from PA waters. However, they do provide links, which most people don't bother checking out.
Click on some of the "useful outside links" and see for yourself. They are mostly concerned with children and women of child bearing age. Most of us do not fit into that.
The reality is that the perch I occasionally catch and eat has less mercury in it than canned of tuna.
Why do some people think that if it is purchased from a store or restaurant, it must be safer whether it is fish, meat, or even honey. Bam, I am not singling you out or saying you are that way, it was just your post that inspired my response.