Hungry sharks filmed swimming metres from oblivious surfers at Sydney's busiest beach

Two large, hungry sharks were filmed swimming metres from oblivious surfers at Sydney's most popular beach this morning.

The footage was captured by Drone Shark App at Bondi Beach, in Sydney's eastern suburbs and showed the sharks - believed to be grey nurses - feasting on a large school of salmon close to the shore.

At one stage a surfer passed within metres of one of the sharks.

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Founder of Drone Shark App Jason Iggleden told 9news.com.au he often sees large sharks feeding around salmon.

He cautioned swimmers and surfers to avoid the schools and swim closer to the beach.

"Don't hang in the schools, that's where I see all the sharks charging in for the deep," Mr Iggleden said.

The drone operator said he was amazed the surfers had no clue the predators were feasting only metres from them.

"The swimmers didn't even know," he said.

"At one point, one swam right over one."

Mr Iggleden hadn't seen grey nurses, a species listed as vulnerable, at Bondi for about eight months.

He believes they returned to feed on the large schools of salmon.

"Their movement depends on where the salmon are, and the salmon only just returned," he said.

In this instance he wasn't too concerned about the surfers' safety as the grey nurses are typically placid and only "sometimes inquisitive".

However, just four days ago Mr Iggleden filmed a Bronze Whaler feeding on the salmon at Tamarama, Bondi's neighbouring beach.

He immediately rushed to the shore with a megaphone to warn the small group of surfers of the potential danger.

"They have been known to attack," he said.

"I wouldn't let them go by unannounced. I would always tell the surfers when they were around.

"I got on the megaphone, but the surfers were happy to stay in".

Mr Iggleden started Drone Shark App as his own "sealife show" and to teach Australians about shark behaviour.

"We don't want to fear these animals," he said.

As well as the sharks, Mr Iggleden also spotted two stingrays, a pod of dolphins and seals off Sydney's iconic Bondi Beach.

He branded the special show a "sealife bonanza".

This is not the first time drone footage has captured incredible scenes off a NSW beach.

Surfers just south of Byron Bay found themselves with some majestic company at the start of the month as a pair of minke whales "surfed" the waves alongside them.

Seaworld's head of marine science Wayne Phillips said he wished he witnessed the gentle giants in action himself.

"Although it's not rare for minkes to be feeding on bait balls of small fish like that, to surf into that bail ball is just amazing," Mr Phillips said.

"The footage is spectacular and I wish I was one of the guys on the surfboard."