When I looked into this last year, it didn't seem worth the hassle (to be legal). For BFT, you need a recreational HMS Angling permit. Sounds cheap ($22) and easy but to get the permit, the MNFS requires either a state registration or coast guard documentation on the vessel. This generally requires red tape, such as a hull ID, and other BS which I've heard takes months.
I hope I'm wrong or the regs loosen up. Last years info is at
http://www.nmfspermits.com/other/05ComplianceGuide.pdf
Rec info on Tuna is on page 26 & 27

oke: