The beast was caught by Danny Osuna Deep sea fishing offshore Puerto Vallarta Mexico in 2012. The cow Tuna weighed an official 432 lbs making it the biggest Yellowfin Tuna ever recorded. The fish is not the official world record due to technicality no other person can touch the rod while the fish is being reeled in the crew did touch the reel but it is still a fish of a lifetime and the biggest Yellowfin Tuna ever caught! a Normal size Yellowfin Tuna fishing in Puerto Vallarta is between 50-200 lbs with about a dozen 300 lb cow's caught every year mostly on overnight multiple day fishing charters,