"It was a bit of a fight without my left hand, left arm and all that, but I just set my hand on the reel, spread the line and then used my right hand to crank it in," he said.
"It's definitely a big fish but it's just knowing what I was doing, using my legs instead of trying to use just my arms to pull it in. It was more my legs."
Waytt said it was the third black marlin brought over the Whakatāne bar and the first in 15 years.
He said his junior record was in the process of being verified and could take up to two weeks to confirm.
The fish will be divided among family and friends, Wyatt said.
- RNZ