4m great white spotted off Rottnest on day of sightings A 4m great white shark was sighted off Rottnest this afternoon. A GREAT white measuring up to four metres has been spotted off Rottnest. Surf Lifesaving WA reported it was seen tracking northeast of Cathedral Rocks at 2.45pm. The shark sighting was one of a number today. Earlier, the SW Westpac Lifesaver Helicopter sighted a two-metre bronze whaler 50m off the western point of Eagle Bay in the state's South West. A three-metre great white and two bronze whalers, both about two-metres, were also spotted 200m offshore of Margaret River Point while a whaler shark was also spotted this morning off Umbies, Gracetown, the site of this year's fatal shark attack. The WA Government announced this week that under its new "shark mitigation" policy any shark over three metres that swam into one of two specially monitored zones along our coast would be deemed an imminent threat and be subject to a catch and kill order. As part of the plans baited drumlins would be deployed 1km from the shoreline to lure sharks and commercial fisherman would be given licenses to kill catch and destroy sharks bigger than three metres. However further details outlining exactly how it would work have yet to be released. Great whites are a protected species.