On the contrary... "farm-raised" fish are specifically bred -- without the (supposed) "mercury problems" in real ("natural" = polluted)) waters...

Secondly, as far as all scientists know... fish have no emotions or feelings. And there's never been any fish species, as far as I know, even nearly on the verge of extinction... but...

Are there a lot of households that keep tuna or salmon or whatnot as pets???