Tuna fishing is very fun, but is very expensive and takes a lot of skill. I got my first boat last year, a 21' seacraft. I had been invited to go other times before and I had caught small ones. They were 120-170 lbs but when I got my boat I wanted to fish for giant. A Blue fin tuna has to be over 73" in order to sell comericaly which we were trying to do. I got all the permits for a comerical licens but we didn't catch any giants last summer. We saw a few jumping a couple times on the backside of the cape, but we didnt hook up.