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http://www.environment.gov.sk.ca/Default.aspx?DN=90437caa-287b-4fa1-9217-8f5e5de1ad34 ...
So yes fish get mercury in them, and yes it can be in the fleshy meat part we, usually, eat. However most of the Heavy Metals concentrate in the Guts and Organs of the fish. So unless you are eating the whole fish, Sorry I know some Nationalities do this but you all gross me the F@#% Out, likely eating just the flesh of the fish is not going to have much affect. Some of the best lakes around here for Crappie have warnings for the Mercury levels found in them. Talked to one of the main fish biologists out here and he confirmed that the levels in the actual fleshy fillet are minimal compared to the levels in the guts, but they test the whole fish not just parts.
In Saskatchewan, it is only the flesh which is tested for mercury and reported on. There are a few lakes here with exceptionally high Hg levels where regular consumption is not recommended for most species.
seems like that would be a better indicator of if the fish are safe to eat or not by just testing the fillets etc. I wondered why they test the whole fish out here. the Fish Biologist I talked to kinda made it seem like they wanted to find mercury so they could report on it, but when pressed he said most of it was in the guts and if you didn't eat them then the levels they were reporting were exagerated for just the fillets. I have seen some, Nationalities-Cultures, that do eat the whole fish and it seemed that these were the people they were concerned with out here.