Four sharks spotted along South Australian coast

As many as four sharks, one about six metres long, have been spotted along the coast of the Gulf St Vincent near Adelaide.

In the latest sighting, surf lifesavers spotted a two-metre shark swimming away from Semaphore jetty about 1pm today.

Less than half an hour earlier, a shark had been seen 50m from shore near Normanville, about 77 km south of Adelaide.

Earlier, a six-metre shark was spotted 3km off Glenelg beach, and a large shark was seen a similar distance from West Beach, according to SA Police.

Police have cautioned people to be careful on the water.