I don't know how this topic was diverted to TUNA? As far as I know, no tuna is being farm raised, but mainly salmon and catfish. My question about tuna was its reportedly high mercury content - whether canned, cooked or raw. If you prefer it raw,I can't say that it tastes any better, but I guess it gives you a better temporalis muscle workout! And hey, it was good enough for Spencer Tracy - but I believe that was dolphin?