The Mercury-Laden Fish Floated for School Lunches | DiscoverMagazine.com
I've posted quite a few times over the years about mercury in fish, mainly because it seems to be a topic they follow closely in the US, but less so here.
At the link is a lengthy article looking at the issue with regard to the dogfish, a type of shark that the US government is looking at using in school lunches and prisons, but not everyone thinks it's a good idea.
Interestingly, I see that the article indicates that Spanish mackerel is pretty high on the list of mercury affected fish too, above tuna, which I don't think I realised before. I don't mind a bit of mackerel every now and again. Certainly, our more premium white fish have now become ridiculously expensive.