The shark was noticed 500 metres from the coast of Aldinga Beach about 8.30am yesterday.
Witnesses reported they believed the shark to be about 4-metres in size, having in contrast the animal to the dimensions of their boat.
Surf Life Saving Patrols had not began for the day, so police had been known as to assist alert the general public.
CSIRO, Australia’s main scientific analysis physique, has recognized two nice white populations in Australia; an jap inhabitants and a southern-western inhabitants.
The jap inhabitants is sized round 5460, however there might be greater than 12,802 nice white cruising the waters.
A quantity for the south-western inhabitants is “not yet determined”.