Better still, tag them before you release them! Bluefin are delicious and you only need one or two for a feast. But they spoil easily so take care of them so you're not disappointed when you get them home.
Just dropping your bluefin on the deck can bruise and spoil the flesh. So dispatch it quickly, then clean it and get it on ice. And learn the easy steps that will transform it into the culinary delicacy it can be.