Scientists and tourists are left in awe after a rare and dramatic encounter on the high seas off the state south coast.

"The stocks of Western Australian salmon are sustainable ... good to see big schools of fish move through along the south coast and west coast," he said.

A giant sunfish that washed up on Western Australia's south coast could be a sign ... that big blob of hot water moved down the coast, bleached the West Kimberley corals, and it moved down into ...