We target tuna when we go on the 36 hour trips. I have gaffed a few yellow fin tuna, we go out to catch fish. There are a few things to consider, when the yft are at the deep spar rigs we do anything we can to catch them, however it is not as easy as it looks. Fish feed when they are hungry, they have been there a few times and just flat out would not bite. If the weather is rough then we go to rigs and tie up, in the history of Williams Party Boats Tuna Safaris (1990) YFT have not been at those rigs( tequila cerveza etc.). So to answer your question we go out to catch fish and target the BFT if the YFT are there that is and added bonus.
Ben
1st Mate Capt. John
www.galvestonfishingboats.com