A group of divers managed to capture the moment a dozen pregnant grey nurse sharks swam in close near Queensland's Wolf Rock.

Senior conservation officer with the Department of Environment and Science, Dr Carley Kilpatrick, said marine rangers believed the 12 spotted could be part of a colony of more than 50 pregnant females at Wolf Rock.

"Wolf Rock in the Great Sandy Marine Park is the only known gestation site for the east coast grey nurse shark population," said Dr Kilpatrick.

With fewer than 2000 individual sharks estimated in the east coast colony, the species has been long endangered, but with increasing birth rates, the population is on the rise.

The average gestation period for the sharks is 12 months, and with warmer weather soon arriving, the females will soon be on the move to NSW's coastline in order to begin the birthing season.

Meanwhile on Sydney's Northern Beaches, a hobby videographer had to wrestle her GoPro back from an intrigued octopus that became more than just a little attached to the lens.

Jane Yost said the octopus tried to pull the dome lens from her hands.

"I decided I would have to pull up fairly fast to get him to release," she said. "It worked like a charm. He was able to think on his feet, all eight of them, and make the hasty decision to abort his mission the instant I pulled upwards with haste," Ms Yost said.

She believes it might have been a Common Sydney Octopus (Octopus Tetricus).

"Its bite can paralyse its prey, so maybe that's why I found a scratch on my dome port," she said. "Just glad he didn't move up onto my arm."