A school of sharks has been spotted feasting on the carcass of a whale off the coast of Sydney.

Financial planner Chett Auditore, 39, was out fishing off Botany Head on Sunday when he spotted the feeding frenzy.

He was on his friend Mark Gunning’s boat, which is about 7m long, when they came across the carcass at popular game fishing spot, Brown’s Mountain.

“We were out there tuna fishing and we could smell something dead,” Mr Auditore said.

The men were fishing for tuna when they came across the carcass. (Supplied/Chett Auditore)

It was then that Mr Auditore and his friend spotted the carcass, and the numerous birds and sharks feeding on it.

“What was quite interesting were the amount of birds around,” he said.

“There were mutton birds and albatross and they looked pregnant.

“They were so fat they couldn’t get out of the water.”

Mr Auditore said the birds were unperturbed by the surrounding sharks.

“Right next to an albatross was the head of a tiger shark, it wasn’t concerned with the shark at all,” he said.

Mr Auditore spotted six tiger sharks feeding on the dead whale. (Supplied/Chett Auditore)

There were also birds feeding on the carcass, not at all bothered by the sharks. (Supplied/Chett Auditore)

Mr Auditore pulled out his GoPro and filmed six tiger sharks as they feasted on the carcass.

“I actually put my hand in the water first, but then we stuck (the GoPro) on the end of the pole and stuck the pole in the water,” he said.

“They were coming over and having a look which was pretty cool.”

The video shows the sharks circling the dead whale, every now and then moving in for another bite.

Mr Auditore's story has since been shared on the Finz Boat Hire Facebook page .