I'm not sure where you are planning on fishing out of, but I take a charter out of Westport, Wn. every other year for tuna. Next year is my time to go again :grin: I know for a minimal fee, they will process your fish on the run back in, so all you have when you reach the dock is meat !!
I don't know the name, but there also is a cannery (meat market ?) in Westport that will process your fish on I think a 2/1 basis. I have never used them, as I just have the fish processed on board, and I do my own canning when I get home.
Tight lines to ya, and good luck on the tuna next year.