Aidan McCormack and Johnny Donahue caught the 8-foot tuna about 30 miles off the Scituate coast in the bay on Tuesday. “It was my first time going out there to catch tuna, so it was pretty astonishing,” Donahue told the Herald a day after harpooning the giant. “Catching a jumbo, it’s the luckiest thing you can get.” “I’m one for one,” he added after his debut tuna fishing expedition. The rising high school sophomores were on a 22-foot boat catching bluefish off of Race Point Beach in Provincetown early Tuesday morning. They then decided to go into the bay off the Cape and drift with the bluefish.