"If anyone is familiar with the Mick Fanning moment at Jeffreys Bay a couple of years ago, it was very similar to that, where a shark pretty much popped up and ended up knocking a surfer off his board", Mr Jovic told ABC radio.
The attack prompted the World Surf League to postpone the nearby Margaret River Pro global surfing contest for about an hour.
Surf Life Saving WA said a four-metre shark and whale carcass were spotted at 10am at nearby Lefthanders surf break.
A man in his 30s was attacked by a shark shortly before 8am (local time).
The attack prompted the World Surf League to postpone the nearby Margaret River Pro worldwide surfing contest.
"We are placing the Margaret River Pro on hold while we work with local authorities on next steps".
'There was a lot more thrashing around.
"The safety of our surfers and staff is a top priority for the WSL. We have mitigation protocols in place and will be enhancing those when competition resumes".
"We're sending our thoughts and prayers to him and his family during this hard time and we're working together to do everything we can to support him and his family", Mr Majeks said.
An ambulance headed to the scene to treat the latest victim, Jason Longgrass, who was attacked at Lefthanders surf break, near to Cobblestones surf break, where a man was bitten on the leg about 8.20am. He is conscious and breathing and being treated for leg injuries.
Fisheries scientists from Department of Primary Industries and Regional Development will inspect the surfboard that was being used by the injured surfer.
Another witness, Brett Newland, told the station it was a "large shark" and that "from the way it was behaving, it would have been a white pointer" - better known as a great white. Nick Edwards, 31, also died after a shark attack while surfing at nearby South Point in 2010.
A 37-year-old man was bitten on the leg at Cobblestones beach in Gracetown, near the Margaret River Pro surfing tournament, on early Monday morning but managed to surf back to shore, reports the Guardian.
All three were surfers.