The sharks photographed are believed to be bronze whalers, with some great whites swimming nearby.
The photos were snapped by Australian photographer Luke Stevens while he was flying in a spotter plane en route over the island.
Stevens said he saw the sharks on the south side of the island and attempted to identify them.
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“I’m not 100 per cent sure if they were all bronze whalers, there were definitely a few great whites on the edge,” he said.
“I absolutely love my job and the things you see.”
The sharks are thought to be in a feeding frenzy, swarming on southern bluefin tuna, which are migrating through South Australia to Indonesia for breeding season.