"It was a very stubborn fish but I'm stubborn as well," she said.
After three exhausting hours a shout came from skipper Scott Sutherland on the fly bridge. "Tuna. World record."
"He knew instantly," Pascoe said. "But the fish had a mind of its own and it went down again. I had to play it some more and it was another hour until we managed to get it up and get a rope around it."
Pascoe and the four men on the boat were unable to get the half-tonne fish on board and had to use the anchor winch to lift it. "Once we got it on board everybody's mouths dropped open. It was absolutely amazing," she said.
It had taken exactly 4 hours and 11 minutes to land the 411kg fish.
They took it to the Houhora Big Game & Sports Fishing Club where it was weighed, photographed and put on ice.
The catch will have to be certified by the International Game Fish Association before Pascoe can claim the world record. This could take several months.
The present world record is a 335kg fish also caught off Northland.
According to New Zealand Sport Fishing Council records, the tuna would be the biggest fish to be caught in New Zealand by a woman.
Pascoe was aware of the huge prices that bluefin can fetch in Japan - a comparatively small 221kg bluefin recently fetched $2.2 million at auction - but because it wasn't caught on a commercial vessel she was unable to sell it.
Instead she would have it mounted by a taxidermist and give it to the Houhora Big Game & Sports Fishing Club.
Charles Hufflett, a director of New Zealand's biggest supplier of bluefin, Solander Fisheries, said depending on its fat content, the fish could sell for up to $82 a kg. At that price, the 411kg fish would fetch $33,700.