Eric Flynn who was sailing off Black Point on Sunday said the whales looked like Southern right whales.

"They looked like Southern rights, they had those big growths on their heads."

Tony Bramley from Whyalla Dive Services said he has told his staff to be on the look out after he heard the reports.

They haven't had any luck sighting the creatures however.

"I've had my guys on the lookout, we're out there every day but we haven't seen anything," he said.

According to the Department of Environment and Heritage record numbers of Southern right whales in the region have been joined by a pair of humpback whales.

The southern right whales travel from the Southern Ocean to spend the winter months along the Southern Australian coastline calving and mating.

So far this year 53 Southern right calves have been born in the Great Australian Bight Marine Park, at the Head of Bight, about 1000 kilometres west of Adelaide.

Simon Clark from the Department for Environment and Heritage said the Head of Bight was one of Australia's largest and most consistent Southern right whale breeding areas.

"The Southern rights have distinctive white callosities, or raised rough patches of skin on their heads, which can be used to identify different individuals," he said.

"Right whales are so named because they were the 'right' whales to hunt," he said.

"Their blubber-rich bodies produce a large amount of oil, they travel at a slow pace and they are buoyant and float when dead."