Ahhh, a man after my own heart. Ain’t nothing better than fresh black fin. For sashimi, I like them better than the yellows.When my buddies and I fish the Bahamas late afternoon tuna bite out of Hope Town, the first couple of Blackfin don't even make it off the boat. Then after we get cleaned up, we hit the fresh tuna as an appetizer before we head out for dinner. Been doing it for over 25 years and no ill effects.
Besides the farm raised stuff he’s pretty much full of it. The others all contain some mercury, but unless you’re eating a pile of it over a long period, it’s not going to hurt you. That info is really easy to find. You’ll also see some pregnant mom warnings, but for the most part, none of us will ever eat enough of any of those fish to hurt us.