A teenager from Sydney's north shore was fishing with friends in Middle Harbour on the weekend when something enormous hooked on his line.

Addison Hodge, 15, found himself reeling in a 2.8m bull shark.

The Year 10 student told local news website the Mosman Collective it took 45 minutes to haul in the shark.

"It only took a few seconds to work out that I'd hooked something pretty big," Addison said, "the thing nearly pulled me into the water."

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Speaking to 2GB, Addison estimated the shark could weigh about 130 kilograms.

He and his friends had been trying to catch a shark with big bait but had never expected such an enormous catch, he said.

After reeling in the shark, Addison and his mates got a few photos with the shark before releasing it back into the harbour.

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Addison was left without his prize catch but with a good story.

"I'll be telling a few mates," he said.

The catch comes a week after diving instructor Simon Nellist was tragically killed by a shark in Sydney's Little Bay.

It was Sydney's first fatal shark attack since 1963 at Sugarloaf Bay in Middle Harbour.